I can see how neutral and opposing fans might get a bit tired of the homerism but he talks so much that he does a really good job of describing each play. You can generally get a pretty good feel for what is happening when he is announcing.
My one (minor) complaint, is that he gets so into it that he even sounds excited during a good play for the other team.
The dismay shows up immediately afterwards, but it can be momentarily confusing.
JW is immediately despondent while something good is happening for the other squad.