Ugh, they've taken a major step backwards and gone down the "old" FFXI path - soloing blows, and partying is the only real way to EXP.
I don't have any problems soloing level 15 mobs as a level 13 MRD (and haven't had from 1 to 13), and reports up to level 40 have indicated the same- soloing is as good as ever. Perhaps even too good. 35-40k/hr in the 30's is nothing amazing.

Gladiator, being slightly more suited for tanking, is going to have slightly harder time soloing, although you're hard to take down. It's easy to notice even at lower levels.

It seems almost a week still isn't enough for people to stop spreading false rumors.