Ok, let's get the bad out of the way, since my overall experience there was not just good but great:
I would like to add "quiet" to the list of reasons I enjoy the Westin. We were there Wednesday through Saturday night and I only had one instance of "who the hell is that" after 11 and I was up when it happened so not that big a deal.
I can't say this for all of the other hotels I've stayed at for Gen Con.
Proximity to the ICC is the big selling point for the spousal unit. If she wants to take a break it's RIGHT THERE. I guess the same could be said of the connected Marriott but we haven't stayed there before.
Next year will be the Westin again, already booked and paying for it so I don't have to pray to the Registration Gods (who are fickle, just saying) and hope for a good place in the queue.
We love the Westin too! Unfortunately, it is so popular that it is difficult to get. But crossing my fingers that it works out for us every GenCon!
One more shot for the Westin: we had a problem with our housing reservation (since resolved. Q-Rooms, despite my doubts, really came through on this). Westin could have charged us $1,200/night for our first night or even tossed us out on our ear. Instead they worked with us to make sure we had a place to stay, didn't overcharge us, and worked with Q-Rooms even after the con to get everything resolved. Color me impressed.
What I liked about the Westin: they had enough randomly placed tables and chairs on the second story to put together a giant gaming table for twelve near the ICC entrance.
My experience with the Westin was good, but not great. My Fiance was less impressed, but he has stayed at the Westin in India and had overblown expectations of what the Indianapolis Westin would be like.
The Elevator Key card issue was annoying. The Breakfast bar was disappointing. You paid 15 bucks for what you get for free at other hotels. My biggest complaint was the lack of counterspace. All we got was a sink and a little glass shelf to put our toothbrushes, toothpaste, deordorant. The closet was joke. I wish we had a couch instead of a chair, but that is just a nitpick.
I loved the fact the Westin was quiet. The beds were comfy. The shower head was amazing.
I never have many issues with the Westin. Key cards are always an issue, the traffic seemed a little much for the elevators. The TV kept losing signal, which I mentioned in the survey. I wish they would get rid of the old stocked fridge and put in a slightly larger mini fridge and replace the current mini fridge with a microwave.