I generally feel that league has rewarded agression too much as of recent.
(FYI- I am a GP main so take what i say with a grain of salt) I feel that league of legends currently awards aggression in both solo queue and professional play far too much. If you look especially at the support meta, its dominated by lane controlling mages (Brand, Zyra, A little Syndra, and Karma though i suppose she is kinda half and half), versus champions that actually fill the conceptual role of support (Braum, leona, Taric, Blitzcrank,Lulu ). This is primarily because of the introduction of first tower gold, which along with dragon heavily inflates the importance of the bot side of the map.
In addition, you see this highly prevalent in the jungle meta, where almost no power farming junglers remain (Master Yi, Shyvana, Tryndamere,), this is a result of the removal of devouror of course, but that doesnt change the fact that these high early damage outputting characters like Lee Sin, Khazix, Elise, Rengar, Olaf, etc. have dominated for FAR too long, with the only alternatives being something like a hecarim or graves.
What I would like to see is a reversion on the importance of early pressure, i think it makes the game feel as if it is lost from far too early on. I personally find that it takes the excitement out of everything, when one comes to the realization that the next 10-15 minutes of a game are a mere formality after it has been decided so early. I am of course referring more to the environment in high elo ( D3 ish and above), more so than low elo. This doesn't mean it does not apply however, because i will concede i am actually myself only a gold level player as of last season ( and ive been playing for 2 years unfortunately). I am sick and tired of watching people play Darius, all these players do is essentially cheese at level 1 with w and go on to win lane, sometimes even the game, off of it.
That being said, to make a game exciting, you both have to reward risk taking, while also severally punishing people if they fail. My grievence here is that i would just rather play a game that lasts 10 minutes if thats the case, than have to go through an additional 15 minutes while i watch the game helplessly fade from me.
I merely propose the removal of both first tower and first blood gold, and faster diminishing gold on kills, to make it far less worth to camp some poor sap ( again, GP player here), in addition, i also propose more pronounced gains from solo laning, as in increasing the amount of experience one gets from solo farming, more so than it is now.
Those are just my general thoughts atm.