I have the little Samsung 11" Chromebook with 3G and it works well for what it was expected to do. It runs Chrome + (almost) all my extensions and that's what it was designed for.
It was not meant to be a full laptop with regular OS, so if you bought it with that in mind, of course you will be disappointed.
That's correct, don't buy and Chromebook if you want to run a standard OS. It's targeted at people that just want web access and not much else, kind of like a tablet with a keyboard built in.
I'd seriously consider buying one if I didn't need Windows for doing a little bit of coding, there's really not much else I use my PC for these days.
