I only get annoyed when I see players complaining about how OP they are. They aren't really that OP, they take like 2 seconds to destroy. Only thing I don't like is how the Engie can rapidly put up another one. Other than that, they're only annoying occasionally. But that's only when you don't see them coming. If you know where the minisentry is and get killed by it a second time, then that's your own fault.