Kevin Harlan, in my opinion, and I've been saying this for at least six years running is the most entertaining play by play man currently in all of televised sports.
Now before you jump ugly on your pal Nasher here, I said most entertaining, and I think he's the best listen, I didn't say he was the greatest play by play man, IMO Mike Emrick in NHL is, but for my money my favorite listen without a doubt is Harlan.
He's not over the top excitable like Gus Johnson is, Johnson's too hyperbolical for my taste, Harlan's excitement level is controlled, he's an excellent wordsmith, not quite on the same level as Costas is, but up there nevertheless, and Harlan's analogies are spot on perfect, makes you think for a second before you figured out what he just said before laughing so hard you almost pee your pants.
Oh, and Harlan does his homework before all his broadcasts, he knows what he's talking about.