The biggest criticism is the huge UI elements. Indeed, it feels very clunky and
it’s quite obvious that the game is designed with touch interface and a small screen in
mind rather than a keyboard + mouse and a big screen.
That said,
the settings menu is a big giveaway that the UI is far from final. It’s
directly ripped out of the Dota 2 client and it is 100% certain that the UI is
far from finished and Valve will improve it tremendously before the game is
officially out. It's quite likely that the mobile and PC versions will have different looking UI's, similarly to other cross-platform titles like Hearthstone.
Board and Heroes:
The general
looks of the game (board and heroes), unlike the interface, feel top-quality.
The Auto
Chess mobile version is getting a lot of criticism for looking like a generic Chinese
mobile title. The same couldn’t be said for Underlords.
The hero models feel
slightly less detailed than the original Dota 2 models (it’s likely they got a reduced poly-count to make the
game a bit less hardware-intensive and adequate for mobile), but they inherit Dota 2’s
great designs.
The board itself feels closer to the polish level of mobile
titles like Hearthstone, and miles ahead of Chinese mobile games.