What do all (or most) of the most picked top laners (competitively) have in common?
Sustain.
Irelia? Sustain. Olaf? Sustain. Swain? Sustain. Maokai? Sustain. Vladimir? Sustain.
Riot, you can't expect to nerf sustain on almost everyone except a few and then expect that few to not be overpowered. Seriously, this really is the worst Season by far. And I've said that every Season since Season 3 (I thoroughly enjoyed S1 and S2).
Season 3 "there's no way it could get worse than this." Season 4 "there's no way it could get even worse." Season 5 "There's no way it could get even worse than that." Season 6 "Yeah, there's no way..."
Season 7 "...there's no way..." coming soon to a theater near you.
mains very much did not. S3 was when Zed (and other assassins) kicked a lot of mages more or less permanently out of mid-lane.
Also, season 3 had a horrendous pre-season. League of
, league of
, league of
.
Due to the armor/MR changes, a lot of people playing tanky champions also freaked the F out and the community didn't know if purchasing armor was even worth anything. Ezreal proved it was pretty effective, because that's when Blue Build became a thing for him.