Grind for what? It's a 20+minute game and you're done. What bad aspect does it take from arpgs or rts in terms of gameplay? I played diablo 3 that supposedly has the best moment to moment combat in arpgs and was bored. Only finished it on normal cant be bothered to level up, grind loot to have fun weapons. Community sucks but there are some good people and I mostly play with friends. Though I do occasionally enjoy riling up particularly mad players.
I enjoy working with my team to overcome our opponents it involves mechanically playing well to ensure you have an advantage winning the battle on your own lane, constant awareness of your enemies and teammates actions, synergising with your teammates and countering enemies through both skill and item choices. It also involves choosing the right strategy to counter the enemy, sometimes you just can't man up and fight 5v5. Never played a game that requires this much cooperation to be successful at, even in a team based shooter you can pull of solo clutch plays that would be far more difficult to execute in dota.
All this and it's creator isn't afraid to make major changes to the meta every few months so things never get stale.
