They are not. They are very simple to adjust and aren't any different in function than any other adjustable trigger. The only thing 'borderline' about a bad trigger adjustment is the borderline retard who screwed it up.

I'll admit though, the internals on newer remington triggers aren't as nicely made or as polished as on older rifles. I broke an old corroded screw off while adjusting a trigger on an old 700, so I bought another 700 trigger set. I couldn't get the new trigger to break as crisp as the old one, so I ended up removing the internals of the old trigger and placing them in the new trigger housing. Having the engagement surfaces polished up as part of a trigger job is certainly worth the price.