I'm a long time DotA player and a HoN player. I have to say a couple things really turn me off to LoL that keep me from playing it consistently. Last time i played was about 3 months ago so let me know if any of this has changed.
First: The mini map. Its on the wrong side for me. Its on the right my entire life the mini map has been on the left, its just unnatural to me.
Second no CTRL 1 hot keying for my unit. I spam the number 1 to get to my unit like it's my job.
third: no courier, might have changed, dunno
last: low unit selection for started players. Minor grub really, i get that its a free game and to make money players are able to buy new heros. I have no problem with that, just think that the starting pool could be a bit larger.
lemme know if any of those things have changed please