Good God, I would never recommend this to someone if my life depended on it. Here's my reasons.
-Spamming of the Tau Cannon. This bad boy can go through multiple walls, not hit you, and kill you. People SPAM this a LOT.
-Excessive bhopping. You'd be lucky to kill someone who does this a lot. Like really lucky.
-Spamming of MP5 grenades. These are OP as hell in this game, and people love to spam them because they don't know how to use the primary function of the MP5.
-Rigging of the map with tripmines/satchels. If you see this happening you're screwed. Generally every single corner and spawn would be rigged. And these are OP as well.
-Spamming of the RPG. Yes, people do this. It's annoying.
-Ability to press the Crossfire nuke button multiple times, causing multiple nukes. Really, Valve?
-Most servers give you longjump on spawn, making bhopping excessively easy.
-Subtransit has two trams now because of glitches with updates.
-Most players are A-Holes. You kindly recommend [not even demand] that they use a different weapon and they go apesh't on you and call you a whiner.
-HACKERS. Most of the players are hackers, even the admins. So that means you can't report someone for hacking. They will not care.
-Hypocritical servers. This one server has swearing in its death sounds, yet it's like "no swearing plz". No one enforces this though.
-People tend to wonder why this game is near dead. The things I listed above are most likely why.
And those are my reasons. This game is NOT worth it. And if you're good at FPS's, that's not enough. You need to be extraordinary at FPS's to get around in this game. Never buy this game. EVER.