Artificial Incompetence.
Strange mix, this one. Graphics decidedly clunky, framerate rather poor, considering the dated graphics, however the gamplay IS fun. Mostly. Sadly, there seems to be a bug that, when you log on online,there is a possibility of your single player campaign refusing to load any more (a Google for "General Protection Fault" shows this is far from uncommon). This is the case for me, hopefully there will be a fix for this soon.
There's lots to this game, the multiplayer maps are great, the single player campaign is great when it loads, and the terrorist hunts WOULD be great... ...if the enemy positioning were implemented better (MUCH better). They only spawn close to you (sometimes behind you in an area you've just painstakingly cleared), so you can look out of a window across the whole outdoor area of the map, sniper rifle at the ready, and you'll be waiting a long time, until an enemy spawns right behind you. Rather than a terrorist hunt, its a game of "triggering the spawn points". Very poorly implemented.
Then there's Tweedle-dumb and Tweedle-plain-brain-dead, your "sidemen" in need of constant babysitting. Do NOT expect these muppets to cover your rear!
Another quibble (easily fixed, though) is the gunsight zoom is defaulted to a press of the mouse wheel, however a ROTATE of the mousewheel switches weapons. It really isn't easy pressing the mousewheel without accidentally rotating it...
I initially had a lot of fun, and the review was going to be much more positive (multiplayer's great, the off & online rewards system is a really nice touch), but the bugs and AI issues ruin things, frankly.