Why the wing and other parts blow off easy I don't know, shouldn't be like that IMO and it's not the only plane.
The engines however were fragile as hell, the "props" were actually made of a kind of Aluminum instead of extra strenghtened iron (made them lighter but broke up easily, even without hits). The engine life without maintaince was about 25 hours, a single 50 cal into one of those engines would completely shatter the "prop" and maybe even put the engine on fire. Nothing wrong with the engine dammage there.
When it comes to killing fighters, it is harder yes, but far from impossible, a lil while ago, I had 17 kills in a sortie (2 realoads) with teh 262, all but 2 were fighters and almost every single one of the fighters knew I was there and manuvered hard to avoid, it's a matter of setting them up, getting the snapshots infront of them.
Don't think it is overpriced at all, should take more dammage (except in the engines) but otherwise fine.