This article is more about the stiff animations and performance issues than the bugs and save issues that tend to plague Telltale releases. They're not the main reasons I haven't touched whatever they've put out since Tales from the Borderlands, but I feel him that it's frustrating to see things don't change on that front.
There are no GotG spoilers in the article.
Telltale's history of hobbled tech goes back a ways, too. A source told me that even as the company was riding the success of The Walking Dead, their engine didn't have a physics system. (Telltale has their own proprietary technology, it doesn't use Unity, Unreal, or something else off the shelf.) If a designer came up with a scene requiring a ball to roll across the floor, or a book to fall off a shelf, it had to be hand animated by someone, an enormous time and resource commitment.
It's my understanding that little has changed since, but Telltale didn't respond to my request for comment.