I’m afraid it’s bad

Hello, this afternoon I pick up my new used TT Quattro, 225 HP BJ 3/2000 with 40TKM from the friendly Audi dealer. Actually a great thing, but: now I read in the forums only something of defective LMM ́s, engine damage, permanent workshop stays…. Is it really that bad??? First save me the used car warranty?? Is there something I should pay attention to at the vehicle transfer? Wandy