It really really depends on the office and their practices. I visited (and later brought my mom) to a cardiologist who is a terrible doctor, but his office does instruct you to log your blood pressure and then they review the logs. So at least they do that right.
What they do wrong: Queuing up 10 patients at a time, seeing like 60 a day, and then jumping from room to room like a kid with a bad case of ADHD. Dude told the assistant to give my mom 1 bp medicine, rushed out to another patient, and then rushed back 2 minutes later "no, give her this one instead!"
I can't trust that LOL. Our primary doctor got mad at me for taking my mom there and called the cardiologist a "f-ing a-hole" because he had a bad experience with his aunt going there LOL.
Honestly I ... I won't be going back, but I don't hate the dude. He's generally spot-on, even if he's rushed and his medicine advice is sketchy.