I'm not claiming V3 is perfect but on my small laptop, the format is quite acceptable & I've adapted to the new menu layouts & functionality. I think the alerts/notifications are an improvement on V2. My inbox is also a lot easier to manage now.
On the downside, I can't paste a list of teams (for example) & make them numbered or bulleted because it only works on the first item. Also, the automatic engine analysis in Game Editor is a nuisance.
So why do some people hate V3?
I also hate version 3 and would welcome the turn to version 2, with all it's flaws...