As for the second part of my reply, Swifty mentioned Aleitoc and some other dude - in the part where I quoted your reply to Swifty I also quoted that "other dude" he obviously meant and you obviously ignored.
Once your done learning in LoL ide really suggest going onto dota, you get 100x more out of the game when you play at that level, unfortunately you will probably suck at dota even after 500 games of league. The learning curve is like a brickwall with thumbtacks on it, but once you learn it you'll be all like "MAN that courier is hella useful" or "how the hell have I lasted this long without TP scrolls".
I personally after having played both for a very long time would say that you should learn in dota, not because its less forgiving but because you'll be amazing at LoL once you have. If you want to know which game looks better its definately Dota (valve are just immense at anything they do) I know artstyle is subjective as hell, but if you appreciate fine detail and quality then theres only 1 choice.
Bug wise, dota2 is still in beta however theres really not a lot of bugs, the occasional shop glitch and stuff, all usually just require quick reboots, LoL doesnt have much bugs either, its mostly all pisspoor lobby / website coding. Although occasionally you might fire an ulti at someone and itl go straight through them.
I like both games and LoL is my prefered choice if I cant be arsed playing something too difficult but if your asking me based on what is a good all rounder on the dota scene, then Dota 2 beats the competition. (I dont count smite cause its not really the same genre imo)
I think the reason playing LoL a lot won't have a high effect on Dota 2 is because they have quite a different "feel".
If you play LoL, then play Dota 2 (or vice versa), you'll see what I mean.
Okay, as an example, let's take Mario and Sonic.
Mario is about getting to the end safely, jumping around on the right spots at the right time.
Sonic is about getting to the end as fast as possible, being about reacting quickly to things that comes at you fast.
It's that kinda thing. They're two pretty similar concepts, in the same genre, but they still have a different "feel" to them.
I gave a warning and it was ignored. Game bashing and flaming other users is not acceptable, thread closed.