Did this anime turn out to be somewhat watchable?

I remember that I watched the first 3 eps or so, when that little witch joined the party
so I probably missed the best character in the series (the girl with the lollipop in her mouth, at least 4chan seems to like her so much :P)

and when I browsed on you-tube I came across the opening of season 2 with a different song and was really amazed by it

http://www.youtube.com/watch?v=8uVPfPkvpZI&fmt=18

this sounds/looks really cool.
So is this show entertaining? I'm not really expecting drama, just some carefree comedy.

btw they really did a *great* job with the opening animation, didn't they?