April, I wouldn't say any of that - I work with a lot of GPs practices and yes, things can vary, but by and large the service is good. The drift from the thread about waiting times earlier this week was "we don't really mind waiting because next time, it could be me the doctor's seeing when the appointment overruns" - I'd rather be seen by someone who gives me time, that someone who doesn't. As for the computer screen - all records are now on the screen, they have to look at the screen, and telemedicine is the way forward - far more efficient than going to have to thumb through reference documents if they want to check something out.
If however you do want to make a complaint, every GP practice has an official complaints process (details of it will be available in reception) - you start by putting your complaint in writing and addressing to the Complaints Manager at the surgery. They have to respond in so many days in writing then give you a date for a report after their investigation into what you're complaining about.