I have been watching loads of CSI (all three ) recently and haven't a bloody clue which episode goes in which series.The ones on living are obviously repeats as Speedle is still in them. The ones on 5 US are new - i think.
Anyway, in answer to the OP, i cannot stand Horatio. I think it's the sunglasses thing, and the way he stands. He never stands straight at people, he is always standing at right angles to them, with his head on one side, and his specs in his hand, a bit like a parrot who has fallen of his perch.
Now, Mac Taylor, from CSI New York, is a different matter, like him.