Literally unplayable except in Mann Up Mode. There are bots EVERYWHERE and Valve does not care anymore. The only way you could have a decent vanilla match is if you are lucky enough to find a community server with people in it, but good luck finding one of those. 95% of the community servers are either some kind of convoluted game mode (of which only half are actually fun) or a trade/strange/achievement farming server.

Beware when installing this game. It is possible to still have fun, but it is difficult to.