I guess so, best way to get your frustrations out for the day

I partially agree with you on this one.
For example getting a lot of 'kills' for the stats is not very good if you are for example a medic, but if you are a heavy, seeing that you killed more this round then your previous is a nice bonus.
Same with the achievements, what good is having an achievement like placebo effect, you don't go running around killing people when you have an uber to push forward with.
Again however I must admit that I too have had a good try on the Intern and Specialist achievement, yet those still have something to do with the class you play.