Bring Back Warmog's Armor to ARAM!
If you like playing ARAM, then you most definitely are affected by this issue. Removing the core item from this game mode was the biggest mistake Riot has ever made. I cannot imagine myself playing ARAM without Warmog's Armor. The reason why I think this is a big issue is simply that it takes away from the entire experience and the games taking too long to finish. Without Warmog's Armor, ARAM games are now at least 25 minutes long and sometimes even take 40 minutes to finish. One of the reasons why I loved playing this game mode was because it took 15 to 25 minutes to finish a game. I hope there are some other players who think that Riot should give us back Warmog's Armor. 
going in, killing a carry because of his insane damage, and managing to escape with 1% hp, and then being 100% hp in a few seconds.
is a core item on most mages (in ARAM), presence of mind is insane, to the point that you don't care about mana anymore once you buy it (and it's literally your first item).
Ressource management isn't only about HP, ya know ?