I think it's too early to rate Upton as overrated although I would say he had a great deal of risk in terms of where his power would lie. I reckon he's still trying to get into a groove, shaking off little nicks along the way as well as a corrected shoulder.
As for Rollins, I didn't believe he was worth the late first round pick or even an early second round pick. While it's highly unlikely he'll meet his '07 production, FWIW, he wasn't 100% with a gimpy ankle last year. It's a known fact J-Roll is streaky to a fault, but he's still a good bet for Shane Victorino-like numbers at a premium position (15 HR, 35-40 SB). Once he trades those popouts for line drives (which he hasn't to the point he's unlucky), he'll come around.
I somewhat agree on Berkman. It was difficult to gauge what kind of Berkman you'd get at any given time, given the last couple of years, he's either hit way too many groundballs or way too many flyballs in 1-2 month-long spurts. So, for me, Berkman was a hitter I skipped over in H2H leagues in the hopes I'd get him while he's undervalued. That said, you stated Berkman would wind up with 30 HR and that's about what most owners would've expected. I doubt those who drafted Berkman had expectations of a 40 homerun campaign.