Man, after playing the game over twice, you really see how short the game is. The first go around your are captivated by the story and dream sequences, but as far as the real action between those scenes, it's just a shock.
If they would of added one more chapter...just one more!
I would also would of liked them to incorporate some stuff from other games into the engine. Like silenced rifles, espionage type levels (without alerting surveillance systems, guards, ect..), or something to that affect.
I'm not saying every game should be like Splinter Cell. MP2 in it's own right is just a shoot'em up which it's successful at, but variety like that intertwined with those chapters could defiantly could of made the gameplay more challenging and less flat.