Could you not? I mean, they're cool but it's almost as annoying to play against as sprite decks, and both can be outed with a single negate at the right time.
I don't know. Once their on their 2nd link summon you can negate it's effect and they've already used up their normal and special summons, most of the cards in their hand, and the grave is fairly lacking in turn 1. At the very least, they won't be able to get out that damned toad if you do it right.