I' ve been playing one of the games in my ENORMOUS backlog: Ninja Gaiden. I remember this being the first game I bought when I got the original Xbox. I got halfway through and found myself at a boss with less than half my health and no potions. After she kicked my ass plenty times I gave up and my schedule never allowed me to pick it back up again.  
 
It still holds up if you ask me. The graphics still look pretty good and the gameplay, oh man the gameplay. There is nothing like kicking an enemy away from you (either through a combo  or counter-attack) and to follow him/her/it with a roll, a jump and a finishing slash. The thing that makes it better than say God of War (which I also really love) is that least five different command inputs in the course of 1-2 seconds. That shit really makes you feel like a Ninja.  
 
I also noticed that now that I have played Ninja Gaiden 2, this one is easier to get through. I am also playing different. I play through an area all the way using all the potions and whatnot is needed and then reset the console and play through it seriously to keep my item-use to a minimum. Because that Boss is going Down!  
 
Oh and i got stuck at the damn Armadillo Boss in NG2. In a way Ninja Gaiden can be considered the bullet-hell shooter of the action-adventure genre. Consider this: Every pack of enemies can kill you. When you get to a boss a first encounter kill is highly unlikely since you need some time to study it's attack pattern and discover it's (really short) moment of weakness. Doesn't that sound like a bullet-hell shooter to you? 
 
Oh and besides this one I am getting some achievement in WoW and playing Final Fantasy X although I have an unhealthy craving for Final Fantasy XII. I haven't finished a Final Fantasy since Final Fantasy 7. And the sad part is: I own them all, including the remakes. Except Final Fantasy 6, but i'll wait for the remake. :) 
 
Oh and I plan to get a ps3 soon and I will most definitely pick up Ninja Gaiden Sigma 1 & 2. The last time I wanted to buy a ps3 I ended up buying the GTX 275 videocard instead. :P Not regretting it.