I think Kraft deserves a TON of credit for building the stadium with his own money and that alone makes him a great owner (and maybe is the most important thing an owner can do other than not interfering with on the field operations).
Patriots tickets aren't THAT much higher than the rest of the league even if they're among the highest:
Average NFL ticket price 2018 | Statista
It's 8 games a year (plus pre and postseason), it's not a huge deal and that's not how Kraft is recouping his investment.
The sports business model is generally ****ed in cities having to pay for stadiums. The Raiders wanted Oakland to build a 1.5 billion dollar stadium. Do you know what city has a lot of problems with schools and crime and can't afford 1.5 billion dollars to build a stadium? Oakland. And then the Raiders left because of it. Say what you want about Raiders fans, and I do all the time, but that SUCKS.
So anyway, any owner that builds his own stadium instead of fleecing the public is a good owner in my book. Even if he gets all of his money back, it's still hundreds of millions of dollars more that taxpayers don't have to subsidize billionaires.