You can get ENBSeries to look pretty good in Mount & Blade, but it pretty much looks like crap in every other game I've played. It's good for screenshots, but anything else just makes my eyes hurt.
It also disables dual-core and forces the game to run on a single core (only on some processors though I think, I have that problem myself, aswell as a few people I've seen on this forum), atleast in mount & blade, not sure about other games.
If you check the enbseries website (http://boris-vorontsov.narod.ru/download_en.htm) you can find a list of setups for different games. I've not gotten it to work in games like Call of Duty 4, Mass Effect and Crysis though. I think it works in fallout 3, but it looks awful.