Support rework
The support rework (utility + gold) was a complete an utter failure, i've been saying this since mid S4 but no one actually seems to notice that.
Base damage and utility of every support nerfed for some AP utility scaling that you simply won't be able to make any use of (except if you're Janna or solotop Lulu, yes a solo laner Lulu uses those scalings way better than a support Lulu)
http://www.reddit.com/r/leagueoflegends/comments/35k4gl/spoiler_msi_stats_picks_bans/
Thresh 71.43% pick & ban, followed by Annie, Nautilus, Alistar and Leona
5 tanks (Annie is played as a tank with talisman + glory) out of 5 top picks, how is this any balanced?
where are Sona, Zyra, Karma, Soraka, Janna (only 10% but still better than others wich are simply non-existant), Nami, Lulu (only played solotop-mid)?
can we have a botlane that is not made of CC bots "who CCs the one first wins the lane"?
it's not even a metagame problem, since the only and ONLY time we saw non-tank supports being picked more than tanks since S4 was the Janna-Nami-Thresh S4 worlds era