He's not saying that being in Vegas has made him suck, he's saying that playing in Vegas makes it difficult to properly evaluate players.
Yes, that's what I'm saying, not that it stunted him, but that it does make it difficult to evaluate players. Look at Wallace this year in AAA Las Vegas, 18HRs, 61 RBIs, .868 OPS (I think he was injured for a bit down there also), that looks pretty nice I think, like someone who is ready to come up and put up at least average numbers if not better.
But what does he do in the pros over 20+ games? 0HRs, 5RBIS, .518 OPS. That is one hell of a drop off, like not even remotely close to his AAA figures. So when I look at AAA, I realize there will be some drop off in the pros usually, but when I look at Las Vegas, the stats are so inflated there that I now can't even assess what the actual drop off will be.