I do think there are loads of pretty cool features that will take some time to get used too. I have to say Im not too keen on the member reputations and stuff, I think it will be abused. Also, the mobile browsing is not a fun one, at least I find anyway.
Another thing that mintlou mentioned and I totally agree, when browsing topics there is far far far too much space in the middle of the screen. It looks like it was designed for this guy