I would say we have a lot of evidence that great candidates enjoyed doing our challenges, but certainly it isn't for everybody. You are free to not do the challenges.

As for your secondary point about the quality of our team, I encourage you to read our engineering blog (http://www.thumbtack.com/engineering/) and look at some of our open source contributions (https://github.com/thumbtack). I think you will find more than enough material there to see what our engineering team is all about.