We stayed at MGM once before and really liked it. We have comped rooms for our visit in March as well. I had also heard about the West Wing being a bit dark and also that the bathroom opened up into the room so privacy was an issue.
MGM IS huge, however, I think the signage is good. I also like the location on the strip. Additionally, it has a monorail station. The monorail can be a bit pricy but it is a great, safe way to quickly get up the strip!! Make sure you sign up for the Players Club ... that's how we are getting comped rooms.
Sometimes you can get a free room upgrade if you try "the $20 trick" when checking in. They will ask for your credit card and ID. Just put a folded $20 bill in between and, handing it over, ask if they have any complimentary upgrades. If they can't help you, they will give the $20 back. We tend to get upgraded 75% of the time we do this!! Last time we tried this at Bally's, we got upgraded to a HUGE, suite!!! It was great!
Also, I have read that from the West Wing there is a "short-cut" to the strip. You may want to check into this.
Otherwise, based on my experience, I think MGM is a great choice. You have Tropicana, Excalibur, NYNY on the other corners all connected by over-the-road walk-way. From Excalibur, there is a free monorail in front that connects you to Luxor and Mandalay Bay (there is also a back, internal walk way between the three properties as well). Across the street, just to the North is Monte Carlo which also has a free monorail (in the back) that connects you to City Center and Belliagio. So, yes, MGM is a great location.
Also, MGM has a food court in addition to all the expensive restaurants. You can go on-line to get some great 2-for-1 coupons for Nathan's. I know you don't gamble, however, you do get free drinks while playing. Just find a low limit game to play. And PLEASE remember to tip your waitress $1 for each drink (whether it is bottled water, coffee or alcohol). That's how they make a living and you will get continued service this way as well.