There's nothing really wrong with the 2, but the processor in the 3 is a huge step up from the 2. So it's just a little bit faster doing pretty much everything.Why do you advise against the Roku 2? I got that one because it came free under their promotion. I don't have any experience with any other streaming device, so am not sure how they all compare against each other. But the box that I was sent works great. No issues at all with the stream. I have it hard-wired via Ethernet cable into my modem (speed tests average around 90 mbs download). I haven't tried it in Wi-Fi mode yet. Also I pretty much only use it for Pac 12 stuff on a secondary tv set. My primary set up is still DirecTV. I'm happy with the Roku 2 in terms of what I need it for.
It's one of those things where as long as you don't know what you're missing, you are happy with what you have.
I've never had the 2, but when I go to my sister's and use their 2 it drives me batty. BIL was perfectly happy with the 2, until they spent a week with us - then he went and got a 3 (and a tablo).