I consider the lack of effective anticheat as essentially making the game unplayable/abandoned, regardless of whether or not they fix minor bugs or localization issues.
TF2 is my favorite game, and basically the only game I play. While playing on Valve servers can be troublesome in off hours, its usually bot free when playing during peak times. Also there are tons of community servers that are completely bot free all the time, so while valve may have mostly abandoned the game it is completely playable.