Yep, Dota needs some "getting used to". A dota player sees things in a combat where we, people who don't know the game, just see a random carnage.

guy why do you talk so much shit?
this idea was made by pizzaslice to give dota more popularity, cuz you can only watch dota replays with WC III and it should be available for more guys...
and its also very interesting for dota pros or decent dota players not to waste 60 minutes of watching, instead 20 minutes where you have everything interesting in it...

but its sadly true, its not mass spectator friendly but i think pizzaslice works on it...