The problem, ultimately, is that every place is made up of people. People are fallible, limited, and not gods. They're just people. They have to eat and sleep. They like having interpersonal relationships. Sometimes they're jerks.
When I joined Microsoft as an intern in the Mac Business Unit back in 2002, my biggest surprise was that the people I worked with—the first real software engineering organization I'd ever been exposed to—were just people. They weren't perfect, and sometimes they got grumpy when a certain over-enthusiastic 19 year old wouldn't shut up.
Anyway, back to your question: Blizzard is probably an interesting place to work. They maintain the biggest(?) MMORPG, they have a huge amount of history, and I expect having a role at Blizzard on your résumé looks great. But, since it is the games industry, you should probably expect endless death marches, crappy pay, and incredible amounts of churn in between projects.
tl;dr: check Glassdoor and see what employees have to say. If you have unreasonable expectations about a workplace, you will be disappointed.