I think the previous beta's have been much more stable when it comes down to the OS itself. I find basic things like trying to take photo's, safari, app switching and stuff crash or lag a lot.
However app wise seems to be better, with the odd exception like Skype.
Still, it's only the 2nd beta and I'd expect they spent a lot of time getting the iPad OS ready to go so lets hope the next couple of releases start improving.