One of the force of TCE is : it's a cross-plateform game (works on Linux / Windows / Mac)
All good servers have a great anti cheat protection : PbBans
I mean there is PunkBuster + private server configs (Cvars + MD5 file checks)
+ the HUB real time scans (Generic Cvar Scans + known Bind Scans)
In clear the game can be considered as clean, but TrueCombat Elite is an hard game, so you need to practice a lot before being able to do same as strongest players. Some glitch/bugs may confuse some people too.
Also keep in mind that most of clan-members play connected on TeamSpeak
servers, so they might get a better teamplay (if you don't have a TeamSpeak server, Skype might be an alternative with friends)
Begin with BodyCount (kill + respawn) servers
in order to get to know the maps, locations and gameplay, then go on some Objective (Plant/Defuse bomb + only 1 life for a round) servers
in order to experience the original design of the game.