The first part is obviously right without question, there are a few older players still hanging around who are below where they should be, and newer players who are very good.
I do feel that playing for a longer period of time gives you must better perspective though, as it should. Take the recent thread on racial for an example. Anyone who played BC would remember that BE also had a rather small, but still effective mana drain that was part of their racial. It was on like a 45sec CD or something, and could help throw arena matches. While at this point Human racial was still lol see stealth maybe if Im lucky, but also on CD. Anyone who played then would be happy to see the nerfs and buffs to each side, but new players just gripe over what it is now.
There are obviously other instances, but that's just what popped to mind first.