Your definition isn't the be all and end all you know. And calling them "adventure" games like that is just plain insulting. Like if someone described what you do as "work". It is possible for one thing to mean many things without each harming the other in anyway. If all you're looking for is hard puzzles then it's a wonder you've ever been happy here as that is something Telltale have never really done.
Games like Back to the Future & Jurassic Park have been lambasted on this site, rightly or wrongly, but the end result of those games has been the Walking Dead which has been a huge success however you describe it. It shows the ability to learn from mistakes and how Telltale are making a name for themselves for doing what they are good at and that success shouldn't belittled. Fine you're not a fan of this path but don't act like it's new nor should you attempt to shame them for enjoying the successes of their design philosophy.
Currently reading... The Servants of Twilight by Dean Koontz
"Time is an illusion. Lunchtime doubly so."