I don't like Motson. I don't like the sound of his voice, he has a hard time keeping up with the game, he seems to think we need a connection to an English club before we know who he's talking about ("ah yes, you'll remember Player X when he was sent off against Arsenal in the Champions league"), his pronunciation can be awful (as can most commentators, granted) and I think he generally ruins a game.
He's probably forgotten more about football than I'll ever know though.
I turn the commentary off when ever I can, it makes things much more enjoyable, especially England games.