Constantly overleveled

Play a really weak levelling build and you'll find that you are much more eager to skip monsters lol

Also it is kind of hard to not end up a bit over-levelled if you do all of the league mechanics, which I personally don't mind

One annoyance of being over level can be the skill gem quest rewards; you might be 42 and don't have that 38 gem you want because you haven't done the quest yet. Again, only a problem on league starter, and really a nothing issue in the grand scheme.