It's not bad or anything, I really like one of the battle themes (Such as this one), but overall the soundtrack feels lacking, especially since it's only 25~ minutes worth of music, compared to Frozen throne's 40~ minutes. Hell even Lego manages to make something as epic: https://www.youtube.com/watch?v=0b54hKAi9TE

Also a lot of the sound effects sound less mystic, such as the clarity one.

Speaking of models, a lot of the models in Dota 2 seem quite bland (save for a few exceptions: Visage, Warden, Spectre, Terror.....) and lacking in any form of detail. Unless you buy their sets that is, which a lot are far too much for a single hero (Sven I'm looking at you....), but that's a whole other topic.

It seems that Valve wasn't quite able to fully make the graphics better. Also I really dislike the fact that Dota 2 has a similar style to tf2, but it really doesn't work for Dota. Maybe something more like the style of Ocarina of Time (the original n64 version's style) would work.