I didn't love it, but most of the time it was okay. In 6th and 7th grade, I didn't do too well in some of my classes, which caused stress. The middle school I went to then had the classes split into two days, 'A' and 'B.' I loved A days, as they had my best classes, but I didn't like B days so much. -_- Overall, I thought those years were okay, but stressful.
I went to a different school for 8th grade, where all the classes were in the same day, though I preferred the other one. I didn't have as much trouble with my classes that year though. I missed my other school though.
Middle school was interesting, I guess. It had it's good and bad moments, but mostly it was nice.