Yeah, I agree with most of that. Screen auto-brightness is an odd complaint, as you can easily turn it off. It really comes down to what you expect out of it, and what you're going to use it for. I sold my iPad Mini yesterday evening, as I didn't really have a use for it after I bought this, but it won't be a replacement for some folks.
I'll save extended talk for the next Cruncheons, but since that might be a while (after PS4 launch), I'll mention a couple of things here.
First of all, the desktop is tiny, so if you're going to be using desktop programs a lot without a KB/M you might want to get a stylus and save yourself quite a bit of frustration. I'm gonna order that $35 "active" stylus off Dell's website.
Secondly, curb your expectations for the gaming. Yeah, it runs some surprising stuff, but graphics-intensive games will make it run pretty hot. You're not going to be playing those for any length of time. Indie stuff and old PC games are fine, some make it get a bit warm but not uncomfortably so.
Battery life is pretty good, considering the size of this thing and that it's running a full desktop operating system. It's going to fluctuate moreso than an iPad or Android tablet, of course. From a 100% charge last night, it's at 58% right now with around 3 1/2 hours of active normal use (web browsing, downloading and installing updates and programs).
Also, remember to update your BIOS and drivers. The latest versions are on Dell's website.