Truthfully the shit aint hard to protect the M-Com stations......when me and my squad play for just about any map we stop them from blowing it up.....all you need is a good tactic and play smart and take out the people with explosives first.
But i do agree you should be able to repair the M-Com stations or atleast give it more health
I think they should leave the damage as it is but like you said be able to repair the M-com station with the repair tool it would take more skill to take the stations rather than jsut rolling around the corner with a tank and jsut blow it up after a while