The thing is i have seen ranged heroes to be easier to adapt to and makes life a lost easy when trying out a moba.
Sniper has 2 passive and a pretty gud ulti and the awesome range means u can pretty much stay out of harms way and still dish out. He is an awesome starter.
Drow also 2 passive and a nice slow which is bound to get u kills. The silence however might be an issue. But her ulti makes sure she has some kinda power lategame even if underfarmed.
Windrunner doesnt have any passives but the kit has a stun and escape and a farming ability. This definitely makes it easier to learn the game.
A melee hero will get terribly outlaned and strength heroes, in my opinion, requires a bit more understanding of the game to start off with.