Not as much as Starcraft, from where I came from. Not until DOtA.
I loved it when I was younger and I still do. I didn't like it at first because I wanted to play Starcraft and nothing else until I played it. I was a sucker for base-building RTS, so it just clicked; even though it's a bit confusing and slow the first time I gave it a try. Then, I learned the how my AI allies build the base on a certain pace depending on their faction and the joy of controlling hero units (leading to more grinding for higher levels for that hero while neglecting the base). And those pretty much made the game particularly excellent, on my book. Sometimes, I wish Blizzard could give some focus to the SP as much as they give to the MP because the campaign on that game was superb.