The never should have made past testing, but is still one of the greater fps's around.
Even when i have to go 45 mins out of my way because the game just keeps bugging on me, i still find myself pulled back to clear sky all the time. Theres times when i have to do the same part over and over and over all night because the event sequencing is glitchy and i still keep coming back.
This game is the bigget piece of crap you'll ever love. Make sure you get the patches, and i eventually added some realism weapon mods, but overall you just cant find this game play elsewhere. It seems to be a trademark for decent shooters to suck technically.
You'll still want to save every time you do virtually anything, and i can only take this game for a little while at a time due to its tech problems (even worse then shoc), but theres still alot to be enjoyed.
Oh, and one final thing, the maps on clear sky are virtually the same (with the exception of one zone), but they redid them and moved all the factions around (which are now all joinable) so it feels familiar but has a new taste to it.
EDIT: so they've fixed alot of bugs, and problems with this game. Im bringing it from my previous 7.5 to an 8, but i would like to recommend a rifle or weapons ballistics mod before i do.