The primary benefit of using Mens Wearhouse as our tuxedo vendor was the fact that it's a very widespread chain of stores. Between me, my groomsmen, and the Father of the Bride, we live all over L.A. and not everybody was available for one big fitting together. So it made things extremely easy to go in and pick the tuxes and enter all the information and let everyone else go and do their measurements on their own time, whenever they could drop by the nearest store. It also made pick up and drop off a great deal easier.
The drawback of the chain experience is that the service is not personalized at all, and a lot of the time the clerks manning the counters were minimum wage workers with very little specialized knowledge and they also were not frequently taking care of tux rental concerns, so they were very slow in their service.
I'll also go on record as saying that I don't know the first thing about fashion, so the actual quality of the various styles and name brands they offered is kinda something I can't speak to in an educated way. But I thought I looked okay, and my wife liked it.
In general the one major reason to go to Mens Wearhouse is the flexibility of multiple locations. But if you're looking to have a bonding experience with all the men in your party and have personal service for that kind of gathering this isn't right for you. It's an in and out kind of place.
We went to the MW Tux/Men's Wearhouse in Marina del Rey and the service was excellent.
They were very helpful and the tuxedos were an excellent value. Because they are a nationwide chain, I was able to order tuxedos for the wedding party in Minnesota, Las Vegas, Arcadia, and Los Angeles and they could pick up their tuxedo's locally. Not every store has good sales people (I went to the store in Westchester previously and had a bad experience) but this location is great.