Played this game both singleplayer and co-op, I think this is generally an improvement on Conviction with fun stealth mechanics, gadgets, etc. The game often lets you play it like a standard shooter, with loud guns, grenades, etc. and playing this way feels a lot more generic.

Even playing full stealth there is some weirdness and glitches, several sections where it seems being spotted is unavoidable but if you replay repeatedly and things pan out just right you can most times avoid being seen.

Still this game can be a fun time and I have always enjoyed Splinter Cell co-op (although it may be a lot more difficult now that Ubisoft took down the servers).