How well do Blizzard games run on iMac?

My PC took a dump on me, and while I'm not much of a PC gamer I do love Blizzard's library. If I play on PC at all it is 99% of the time a Blizzard game. My question is: how well do Blizzard games run on a iMac? I really like Apple's stuff. Our family uses iPhones and iPads and I kind of want everything to be cohesive, which is why I'm looking into a Mac instead of a PC. This is the one I'm looking at:

21.5-inch: 2.7GHz

Specifications

2.7GHz quad-core Intel Core i5

Turbo Boost up to 3.2GHz

8GB (two 4GB) memory

1TB hard drive1

Intel Iris Pro Graphics

Let me know, guys.

How well do Blizzard games run on iMac?