Haha, that's like a perennial topic around here actually, I'm sure I've seen at least 2 or 3 incarnations of this throughout the ages of our forums. Almost everyone agrees many levels are misplaced in the game in terms of difficulty etc. [note: this doesn't just mean wrong ratings, but also whether it appeared "too early" or "too late" within a rating], but if I recall correctly, there are few if any levels that were universally agreed upon by all as such, to say nothing of what people think the correct placement should be.
In other words, if people aren't bored of this topic already at this point, I imagine you'll get a good number of replies.
If nothing else, I'm sure some of the newer members will have something to say.