I use Peak quite frequently, mostly as an editor but occassionally for pseudo-masters, esp. with broadcast/film stuff where there's no time to send it out. I like the workflow, I don't think it's unintuitive - you do need to learn the playlist editor, I admit, but there's a few bugs that are rather dumb. The software has a tendency to just hard crash instead of report errors with some plug-ins that it doesn't like, it occassionally cuts off the end of burns (but only long ones, I find), and one time I batch converted about 85 WAV files to MP3 (all score cues for a film that had to be emailed to the director) and an hour or two later every single one of them was hard static rather than music. The 2nd try worked just fine, but it was time I'll never get back.
So those problems, and the fact that I'm still waiting for master perfection suite and soundsoap pro UBs, are my issues with it, but overall I like the program. It's not perfect, but I've tried Quattro and found it buggy (although this was a few versions ago).
Pro Tools LE can be almost as good for simple editing, I think, and it's cheaper now too [with the interface!]