I absolutely love training camp. I used to take at least a week off from work and go every day.
Due to work obligations, I haven't been able to do that the past two years and instead go to 1 or 2 practices on the weekends.
The team scrimmages are the best. You can't beat it. You are closer to the action than if you were in the stadium AND it's FREE!!!!
The only issues is that due to the obvious popularity of the Pats, the practices are SOOOOOO crowded. When I went I used to be one of the few people there an hour or two early and be patient enough to wait it out. These days everyone seems to have a phone or tablet with movies and thus there are many more people there waiting insanely early (which means you have to be even earlier than that). With a wife and three kids I don't have that kind of time to invest in practice these days.
But for those who do have the time and get a good spot, these really are great.