The install was a mess. It stuck on 93%, so I stopped it. Well, I closed it...there's no clear cut cancel for this. Then, I tried to uninstall. I bombed on me. So, I tried to reinstall...and it bombed. So, I rebooted.
Guess what...when I put in the disk to reinstall, it asked if I wanted to play. After all that mess, I find it actually fully installed. However, I get an error there because I find that you have to go online to enter your key BEFORE you install, so your Battle.net account is linked to the game. Which is probably why the install acted stupid. After doing that, I was playing just fine. It's fun, but this stupid DRM they use which requires you to always be on the internet to play the fucking single player game makes it a pain in the ass from the start.
Gameplay was actually smooth from there, though. I do like how it seems they put your character and progress on a cloud, so you can play between multiple PCs and keep with the same game/characters.