Ok, read some of the Yelp reviews. None of the bad reviews were outlandish: Being incorrectly booked for a large group is definitely a problem. Not getting a room on a lower floor upon request is legit. But neither seem to rise to the level of being systemic issues.
More: One reviewer complained that the room in winter didn't get warm enough. I can sympathize with that; I'm the type that'll wear sweaters once it dips below 60. The funny thing is, an earlier review complained about the "sweltering" rooms. That was all winter, though; obviously August temperatures will be in the exact opposite direction.
Rooms are not "luxury".... didn't think about it, but yeah, Indianapolis rooms aren't exactly that way even in the top end hotels. You'd have to be in the Conrad or Omni to get a plush room. Maybe the JW, I'm not sure. Even the Westin in Indy wasn't as good as the Westin in other cities I've been too, although it was still really damn nice.
Funny but true complaint: Had to drive around the block to determine which was the entrance... heh, yeah, I never thought about it since I'm there for multiple Gen Cons and semi-regularly for business as well. But now that I think about it, I can see a first timer being confused.
On the one hand, those complaints seemed legit. On the other, I'd still take a Hyatt room for Gen Con in a heartbeat. Maybe I'm too easy to please in that regard, I don't know... but I didn't think the Yelp reviews rose to the level of scaring me away from that place. Legit concerns, but not "OMG no" ones to me.