I've inspected several San Antonio M/I Homes in the last few months including a pre-drywall inspection for my clients this week. It was one of the tighter frames I have been in lately. The builder did miss two broken/damaged trusses though.

Having been a PM for Perry Homes for about 250 homes, I believe quality of construction comes down to the project manager in the subdivision. If the neighborhood is generally clean; trash and good materials are well policed, streets are clean and the homes are generally clean you have a strong indicator the management in the community is doing a good job. If the homes and lots are a mess, you have a strong indicator they are going to have quality issues.

Secondly, if the manager is walking his homes twice a day minimum to ensure work is progressing for the next trade so that they can effectively do their job, you will have better quality. If trades have to make dry runs to homes that are not ready for them or don't have all the needed materials, they don't make money and the quality will quickly begin to suffer.

tl;dr No matter what builder you look at, ensure the neighborhood is typically clean when you tour it you've got a good indication they will build quality homes. If it looks like a war zone, run.