His voice is annoying, yes... but it's not just that. The hype comes across as being completely fake to me. When Anders loses his shit you know it's genuine because the guy lives and breathes CS. When Harry does it, it feels forced.
Some fans tolerate a certain amount of artificial hype from casters. Personally, I find it unneccesary. If a match is a bit slow and isn't producing enough moments to generate real hype then the casters should find something else to fall back on to keep the audience entertained - like a bit of mid round banter or some interesting facts about the history of CS (something Anders has always been great at).