Too little mass of enemy unit, making it very easy to survive. I'll make a list later of what I have and others opinion of the map.
Medic heal should be changed into a healing salve ability.
Grenade Should be like a Flamestrike Ability.
Too many cinamatic, because everything is still inplay while were watchin cinamatic, thus getting some of us killed. Instead, you should make the talking while ingame play.
Mission pings should be pinging every minute.
Should be able to pick our heroes, maybe you can make a Barrack or a Hero Tavern to let us Select our units.
The beginning needs a better wave spawn or a better defensive barricade, because most people said it was very boring in the beginning.
Don't use the Hotkey, S for a skill. The Default S Key is for the command Stop.
No one liked the mission just abruptly ends just because the Captains dies and had to restart over so the replayability isn't that good.