Welcome to Hero combat 101. You suck, I suck, we all suck. Though, chances are, I suck a little less than you do. Because of a few things.

Assuming you know the controls, your first instinct for fighting off mobs of swordsmen and berserkers etc. will be charging your super attack. That's what people will tell you to do, That is what NOT to do. while in some situations there is call for that, most times you are much better clicking left and shielding. Ever been playing against Paladins and had them knock you back, thats what left clicking does. It allows you to knock back your enemy and is the second most efficient way of killing aside from headshotting.

Know what I said last section about not uber attacking? Well, for fighting the big guys, forget it and just for clarification. Big guys are Non-player controlled Heroes, Bears, golems, and Trolls. Now, this is how you fight them. First, you put as many arrows into their fat heads as you can before they get to you. If that doesn't down them You use left shift and just use it to go left and right, the reason this works is that it not only does a fair amount of damage, it also (and this is the most important piece) gets you out of the way.

Hopefully, this has made you a little less worse, in fact, it probably made you less worse then me.