Ahhh yes the, "you don't want one of them, they go wrong all the time" types that when questioned more closely turn out never to have actually seen an Airstream/TM/FTP/insert rifle of choice.
I do know of one Airstream which has been very poorly and has had to make several trips home. But then you hear of others that are shot week in week out without issue.
As for TM's, I don't think they have a reputation for breaking, after all they are pretty overbuilt. I think it is more a case of people either liking them, or not.
"I'm your huckleberry, that's just my game"