I'm thinking about getting it because I love RPG's like this but I was wondering if it is nearly as good as the PC version? 
How different are they exactly? 
Should I bother with the PS3 version at all?

Well, the camera angle means that the game is a lot closer up. So it plays identical to KOTOR, if you've ever played that. Also the graphics are definitely not as good as the PC version and the frame rate, especially on the PS3 version, is pretty bad. But I mean if your PC can't play it you should definitely just play it on the PS3 anyway, I played it on the 360 and it was pretty good. My only complaints about the game have to do with the game itself, not the porting or console the game is on.  
 
Oh and another thing - you can't queue moves on the console version like you can on the PC version. Very very stupid choice, but it's there.

I highly suggest you watch the pair of Dragon Age Quick Looks before you decide which version to purchase. If you have a PC capable of playing it at a decent quality level, go PC.

I played it on PS3 and thoroughly enjoyed the game.
 
EDIT:  That's not to say that the game looks amazing or anything, but it's still an enjoyable experience.

If you can't play it on your PC, then buying it on a PS3 or 360 is a fine idea.

I played it on PS3 and still enjoyed it. If you can't get it for computer get it for the PS3.

I own it on PS3 and is still a very playable game and I really enjoyed it.

Angles are different, you get a top down view, also the interface is different, you use the mouse with a bunch of menus and stuff, change the camera, apply tactics and stuff like that. Graphics are quite good on the pc I was suprised, no complaints. Then again I have both ps3 and pc version, I haven't opened my ps3 version yet, I could I suppose to see the difference if I wanted to.

Works great, though don't expect to sucessfully play on the harder difficultly levels if you don't got a PC.

Yo, that is a PC game. But if you have a crappy PC, then the console versions seem fine enough.

"Works great, though don't expect to sucessfully play on the harder difficultly levels if you don't got a PC. "

If your PC can handle it or if you are looking for a reason to upgrade your PC, then go with that version.  But, if your machine doesn't have the muscle to pull off the recommended settings, then go with whatever console you have.  I know that it is an excellent game on the PC and that version also offers the ability to mod it so that nagging deficiencies are corrected (like hide helmet from view).  I had a decent rig but an outdated GPU, so I picked up a new one and it's a good looking game that I really love.

I own the 360 version, i hate the 3/6 buttons you can map. It defiantly would be a better experience on the PC.

Hell no. If you get it on PC though, you'll definitely be maxing out the game's full potential. It wasn't meant for console play. It works ok on a console (on 360 slightly better than the PS3 I believe) but it's at its best on the PC.

I played this game completely through on my 360 and really didn't enjoy it.  I'd suggest the PC version if at all possible for you.

i plaid it on 360 and wished and still might buy it on the PC. the controls and graphics are just not up to par but overall a fun and good game!

If you have the option between 360 and PS3, go with 360.  The PS3 has severely jacked up framerate issues, and much longer saving and loading times.  I had purchased the PS3 version in November, and a 360 in January.  Naturally, if I was ever going to play Dragon Age again, it was going to be on 360.