I really liked Mayim to start, and wasn't expecting to, but I agree her schtick has gotten a little old. I wouldn't mind a bit of high spirits, and still don't mind the occasional interjections. She hasn't mentioned her credentials too often for me, but I understand why others feel that way.
But the giggling! Every other question, it seems like, sends her into mild hysterics. Many of them are pretty mundane too. It's one thing if the clue is very clever or there's a personal connection, but it's just been too much. Do one a day, Mayim, make it a good one, and then don't.