I was inclined to agree with Mychael until I remembered that the best EXP camps are at 45+. I'd much rather, at 40~45+, go to a stronghold and level up real quickly than sync down and party somewhere where I won't even have access to my multi-tiered combos. So it really wouldn't be as broken as initially stated.

I enjoyed level sync in FFXI because it brought everyone to a level playing field. If your flag's up, then you can come to our party. 50 levels above us? No problem.