I actually enjoy all the Eurosport guys, with the exception of Carlton Kirby, who irritates me more than anyone on the planet (except Anne Heche). My problem with him is precisely that he won't admit when he doesn't know something. He'll guess, will be politely corrected, and then will repeat the same mistake again.
He should stop talking over people who actually know about cycling, stop talking about Gert Steegmans, just basically stop. I have never muted a commentator on any sport until Kirby came along.
On the other hand I really like the pairings of Harmon/Kelly, and McCrossan/Brian Smith. Backstedt has a really nice relaxed style, and he has the added bonus of still knowing the cyclists, and can also talk well about the cutting edge technology.
Sean Kelly isn't bored, or irritated, that's just his way of talking.