It was actually an OK experience for me all around. The only thing I regret is not getting more involved socially. I was socially awkward and big into MMO's/other video games, so I really was a loner outside of classroom hours.
My first year in HS was at a hood ass school though, so I really didn't enjoy freshman year. Me being a square and somewhat of a nerd pretty much meant that I didn't fit in at all.