Overrated: Probably Belgium and Macedonia, in my opinion. Both are decent songs, but I wouldn't put them anywhere near the top3/top5 that a lot of people seem to have them in, and they feel pretty similar to a lot of other stuff this year. France is also something that a lot of people put a lot higher than I do, but I can understand why that might be, since it's got a decent musical USP.
Underrated: I'd say Croatia and Montenegro, but I understand why a lot of people don't like them. Similarly, I think people are being a little harsh on the Australian entry, but I understand the frustration about us going for a safe, chart-pop song reminiscent of last year's. I'm genuinely surprised to see the lack of attention being given to Albania, Israel and Hungary, though. All three are great songs that I'd expected to be a lot more popular than they currently are.