Great games with absolutely horrible sections?

What great games can you guys think of with a part of the game that makes you want to break the disc it is so poor? 
 
My example would have to be Xenogears.  It is my favorite JRPG of all time and overall one of my favorite games of all time period. 
 
However, climbing babel tower is one the worst sections in any game I have ever played.  The platforming in xenogears is wonky and if you make one error you have to climb all the way up again...  Not to mention it doesn't make any damn sense because everyone is in Gears, which can fly!!

Halo: Reach - Every part of the campaign where Hunters are involved.

Pretty much every game I've ever played... even the really great ones!

Half Life - Xen
 
I hate yooooou.

Dragon Age: Origins - The Fade.
Red Dead Redemption - Mexico and the end.
Morrowind - The beginning, one time is ok but the rest are just painful.
Zelda OoT - The Water Temple.
Mafia - The Race.

The fade in Dragon Age.

God of War III - the last 1/3 of the game. The first 2/3 of the game has all the fun stuff such as Poseidon, Hades, Cronos and Hercules, and all the collectibles. The last hours suck in comparison but only because the first part is so great.

" @Lukaz: Until you run out of ammo. On NORMAL. >:( "

Zelda games - the dungeons.
 
Halo - The Library
 
Sonic Adventure 2 - the Knuckles/Rouge stages

Tarturus in Persona 3 is pretty bad but the bosses kind of make up for it. 

The boss rush at the end of Viewtiful Joe spoilt it a bit for me.

" Half Life - Xen"

" The fade in Dragon Age. "

Act 3 in Diablo 2.

Mass Effect 1 ~ Anything involving the MAKO
Mass Effect 2 ~ Scanning for resources
Halo 1-3 ~ Anything involving the Flood
Borderlands ~ the end fight
DOAXBV ~ Whenever Kasumi rejects a Lisa swimsuit. ;-)

Skies of Arcadia- The ship battles

" Halo - The Silent Cartographer  "

Halo's library just makes me grit my teeth thinking about. And 3's Ark.

For everyone saying the fade in Dragon Age, there is a mod that completely allows you to skip it while still gaining the stat bonuses that you would get from doing it. Its really nice for when you want to replay the game but don't want to do that part again ~.^

Metal Gear Solid 3. 
 
The horrible escort quest near the end. She shuffles so slowly, she needs food ever 10 seconds, you have to kill an unending series of enemies, and if you run too far ahead (i.e. more than a few feet from her), she stops following your directions. 
 
She makes Yorda from Ico seem nimble and responsive. And yet, if I shoot her, I'm the asshole.

Anyone remember No One Lives Forever? That game had some forced stealth sections that drove me absolutely nuts. Getting spotted resulted in failure, and some were incredibly long, with no checkpoints! Argh!

" @Willy105 said:

" Halo - The Silent Cartographer  "

Dude, you're smoking crack. The Library is easily the worst section in Halo.  As has been said before, the Fade in Dragon Age is terrible. I don't know how anyone could complete that stage without a guide. "

" Metal Gear Solid 3.  The horrible escort quest near the end. She shuffles so slowly, she needs food ever 10 seconds, you have to kill an unending series of enemies, and if you run too far ahead (i.e. more than a few feet from her), she stops following your directions.  She makes Yorda from Ico seem nimble and responsive. And yet, if I shoot her, I'm the asshole. "

" Act 3 in Diablo 2. "  

" Mass Effect 1 ~ Anything involving the MAKO Mass Effect 2 ~ Scanning for resources Halo 1-3 ~ Anything involving the Flood Borderlands ~ the end fight DOAXBV ~ Whenever Kasumi rejects a Lisa swimsuit. ;-) "

Sonic Shuffle - Playing against the computer. 
 
I was playing with a backup, and after one game with a friend of mine, he said, "Let's just do one more!" I simply yelled, jumped for the Dreamcast, took the game out, and broke the disc in my hands. 
 
I later sold the original copy for about $2.50, and felt terrible for taking money for burdening others who may play it later.

" Act 3 in Diablo 2. "

The goddamn sewer in Vampire the masquerade: Bloodlines.

The ending farm shit in Red Dead Redemption. 
 
I didn't even play that part and I hated it!

Metal Gear Solid 2 - everything orange in that game sucks. If it was all blue, then I'd be on board, but...industrial orange? As in, the least exciting, interesting colour possible?
 
Oh yeah, and the Fade choked Dragon Age for me; replay value destroyed.

" Zelda games - the dungeons. Halo - The Silent Cartographer  Sonic Adventure 2 - the Knuckles/Rouge stages "

" Act 3 in Diablo 2. "

God of War 1 - Hades.  
 
No, I don't want to lower the difficulty, that only helps with combat. Get rid of the fucking spinning blades and I might not break this disk.

" @groin said: 

" Act 3 in Diablo 2. "  

I never did get past Act 3 in Diablo 2. I can never remember why until I get back to it and end up giving up again. What was so bad about that bit again? 

Uncharted: Drake's Fortune. The part where your only enemy are those Nosferatus.

Those chamber of the fayth puzzle sections in FFX. Closest I've come to throwing a game out the window.

" Skies of Arcadia- The ship battles "

" Zelda games - the dungeons. Halo - The Silent Cartographer  Sonic Adventure 2 - the Knuckles/Rouge stages "

The section in the first Max Payne where you have to walk along that blood path while that goddamn baby cries the entire time. 

Zelda oot It traumatised me as a innocent game loving 7 year old it really did.

Mass effect=Planet exploring 
 
Mass effect 2=Planet scanning 

Any game that features a turret sequence. Also that rhythm mini-game in God of War 3, fuck me that was annoying, I kept missing the very last note and having to re-do it again, that happened a good 20 times.

The entire final mission in Halo Reach. I don't understand how anyone who isn't on fucking crack would think that any part of that entire stretch was a good idea. I am fucking flabbergasted at how terrible it is. 

Fahrenheit and those hellishly damning flashback stealth segments.