Mass Effect's combat system was ridiculous. Because I didn't have assault rifle -skill, I couldn't even hit the barn-wall from the inside. But since I had good pistol-skill, I could hit enemies accurately from frigging far away. It made no sense in the FPS-world. I mean, sure, if my rifle skill sucks, I'm not gonna do any sniping but I should still be able to burst fire something next to me. And it doesn't matter if I'm frigging Wyatt Earp, pistols just are NOT that accurate over long such long distances.
And if someone is gonna say "Hey G, it was a space game man, they were special space pistols!" then if the pistol is so special, why isn't the shotgun, sniper rifle and assault rifle?
Haven't played Deus Ex. But there was nothing special or great about MA's battle system.
Heck, I didn't even finish the stupid game, got so bored and frustrated with the level of stupidity in there.