I'm renting it for free so I don't have too much to complain about, but I have to say, the the combat is irritating for two reasons:
1) It's extremely repetitive - just mash X & Y to defeat every enemy in the game.
2) It takes way to long to kill almost every enemy; I mean think about it.... Bourne only engages in hand-to-hand combat for more than a few punches with other Treadstone agents, yet somehow in this game every mercenary is capable of going toe to toe with him.
Lastly, I feel like this game completely disregards the point that an elite secret operative is sent in to operate under the radar, yet in every mission they make a point of having you fight a small army.
I would prefer a game design where the idea is to maintain stealth, where if you are spotted you are basically screwed. To me, as it is, the game plays more like a Bond game than like a Splintercell.