I think comparing any moba to LoL is a little unfair just because no moba has been much of anything like LoL. It's a little like having a genre of "counter strike clones" and then RIOT games inc. coming out with perfect dark, HALO, or TRIBES 2 (assume for the sake of relevant release dates that TRIBES 2 was the first in the series). Now if there were no shooters other than games that play like counter-strike and then one of those came out, it's really hard to compare them.
My example was not accidental: counter-strike requires the same types of skills as all MOBAs except for LoL, namely they emphasize fragility, high consequences for missing an attack, and an emphasis on manual dexterity and reflex/reaction times over pre-emptive planning and strategy. (Fun activity: tell a counter-strike player that their game is not very strategic. They rage hard and defend their game with stuff that is very shallow-end strategy.) It's really apples to oranges. You can't even say that one game is "harder" than the other because it takes a lot of time and practice to learn a strategic game, and it also takes a lot of time and practice to learn the proper reactions for a knee-jerk game, and then hone those reflexes and aim accurately instead of just spazzing and blowing your load. Personally I'm very very clever but I have a tendency to over-think things and hesitate, so I'm naturally drawn to more strategic games with a more deliberate pace.
As it stands, League of Legends has expanded these games from "DotA clones" to an actual genre, by making something that actually plays sort-of differently in tone, unlike all the dota-clones out there. Plus there's dominion. For my part, I think all MOBAs except for LoL are absolutely awful, I've always hated all of them, and it's only by a complete stroke of luck that I was convinced to try LoL and got hooked in 15 minutes, even though I was prejudicially convinced I was going to hate it. That kind of upset does not happen over minor cosmetic differences.