If I understand 50% of how to play a MOBA, I can play the game and have fun. I am gorilla. I have 4 moves: punch, slam, eat banana, and my ultimate ability, get mad. They have cooldowns, but it doesn't matter, I just spam all my moves when I see a bad guy. If I don't see a bad guy, I can kill the enemy turrets and little cpu creatures. If I'm having trouble, I can follow one of my allies and often get into 2v1s which are easier to win. And oh look, he is playing Sword Guy, he's doing pretty well, maybe I should try Sword Guy next time.
If I only understand 50% of how to play an RTS, I'm screwed because I didn't realize that I needed to build a t2 bot factory with my t1 bots, which can then build tier 2 constructor bots which are required to build flak cannons which are the only viable defense against this specific type of gunship-based commander sniping.
I like RTS games better too, but I can see how it can be hard to get into an RTS without a really expensive-to-create campaign tutorial (e.g. Starcraft) and/or a huge time commitment. I bet I could download a MOBA I've never played before and have fun in my first match knowing nothing about how to play it (even the controls).