The thing about taking on enemies in stealth games is that every bad guy you run into is blind, deaf, and dumb as a post. Seriously, sometimes you can be standing right beside them (albeit in the dark) and they would have no idea you were there. With Splinter Cell: Conviction, the developers said that wouldn't be the case. Instead, enemies would spot you, hunt you down, and kill the crap out of you if you didn't stay on your stealthy (tip?) toes.
Did it live up to its promises? The enemies in Conviction are a little smarter than the gun-toting terrorists in previous games, I'll give them that. They "hunt" you down by converging on your last known location, the immediately become confused when you aren't there anymore. But when it comes down to it, they are still the same, brain dead chokeout fodder we're all used to. Plus, the fact that every thug constantly taunts Sam, revealing their location, and practically begging players to kill them doesn't make a strong case for their intelligence.