Interested, yet anxious.
My favourite was definitely World Party, but I can't deny that I have had hours upon hours of fun in Mayhem.
Maybe a change in format is what the franchise needs? I love the idea of water physics.
That reminds me... A friend of mine and I made a Worms-like game in the Unreal3 engine a few years back. Environmental physics and all, but still on a 2D plane.
It was quite buggy - we never really finished it - but there is nothing as satisfying as blowing out the base of a tall pillar with a perfectly placed bazooka shot, and having it fall over onto your enemies, absolutely obliterating them.
Good times.