A few improvements that I would like to see be implemented in the game are: I wish the developers limit the ammunition at some point. Giving it unlimited ability kind of makes the game easier. I wish the developers make the characters move a bit faster. Even the fastest hero can move at a slow pace at times. I wish that they create a progression system for the players. That's about it... Otherwise, it has been a great game and just needs bits of improvement. I have no doubt that Blizzard can make that happen knowing that they listen to their players.
I think, with all the hype behind it, it would definitely become a success. Lots of hype surrounding the game, and it was released a few days ago, and I guess it's a really good game, as there have been lots of praise in the media and great reviews about the game. I would really love to play it, but I'm still reading the reviews and see if it is worth the price.