Oh, it is entirely possible for an umpire to be an incompetent plate umpire. I was there, the rest of you weren't. I'll stick with my judgement of him. And as I have stated, I'm generally quite mellow when it comes to questioning umpires.
Okay, it's a matter of perspective, then. Having a questionable strike zone does not an incompetent umpire make, IMHO. I've seen many otherwise good umps that didn't give certain parts of the plate as far as I could tell. I didn't think they were very good, but incompetent is too strong of a word to use for an ump whose strike zone I don't agree with. Like I said earlier, I have seen incompetent umps, but the strike zone was the least of their problems.