Everybody likes Hubcap. He's friendly, always has a clever joke or compliment ready, and is generally a nice, fun, affable bot to be around. On the other hand, nobody actually trusts Hubcap. It's not his devotion to the Autobot cause that's the concern (mostly), but his ulterior motives for his friendship and jokes and the like. He is at his core a con artist, and everyone's a bit on their guard around him. Some think he's this way to cover for deficiencies or to stay in a position well above his actual aptitude level... or maybe he just likes tricking people. He doesn't seem to have made many enemies with his tricks and scams, though; quite the opposite. So perhaps it is all mostly harmless.