Are I crazy for doing it? I have an wacom intuos4 xl for work and I started useing it instead of my mouse and somehow it feels allot faster  on sc2 or civ5, diablo2.  its just a dream come true for me so I kinda wanna know if other people have the same experience  or am I just super stupid and crazy?
Sorry for my bad english and grammer

I work with a Wacon tablet with a pretty decent sized surface. For a laugh I tried playing a game on and was not particularly crazy about it. There's also a battery-free wacom mouse that works with the tablet that I wasn't into.  
 
I'm curious to try gaming with a Cintiq as I think that would work way better than a tablet. 

I had a buddy who used to play desert combat and other fps games with his wacom tablet...  and he was pretty good too.
 
Still don't understand how :D

It's possible, even though I never tried it yet. You are still using a cursor on the screen for your aim so it's theoretically possible and very accurate.

I tried using mine for a few games and it went ok until I actually had to start shooting stuff.  But for more simpler game like puzzle games I think it works great.