User blog comment:TheTobarMethod/Do AP's Need A QSS Upgrade?/@comment-4290320-20130903161424/@comment-5556439-20130904173631

Swain is kind of Sleeper OP I feel but hes not popular because he just doesnt hit hard enough quickly enough. By the time that he has dealt the necessary damage hes most likely dead or about to be.

Hes pretty unreliable and falls off in comparison to other DPS style mages like Cass or Ryze.

Cassio has literally no reason to be underplayed, I cant find anything past her unreliable(not weak mind you) early game making her less played.