you can customize them. this means fun.
also, a generalized com is useless. you have to maximize the effect.
e.g.
-a dual sniper com with all range modules
-a bombard com with all range, plasma artillers, maybe napalm
-a support com with only nanos, has about BP of 60+, with rezz module
these might pay off in the long run.
however, for the lulz, you can design frontline coms, which are very exposed and might not payoff because they are magnets for all kind of explosives.
e.g.
-dgun troll com (which surprisingly often pays off, watch @Saabir in action, 150+ comkiller trophies speak for themselves )
-battlecom with ultra health modules which can barely move
-battlecom with all repair modules which needs a very high alpha to kill
coms are (besides supcom and other games) a very unique feature which bring to this game parts of rpg gameplay. this might be a very popular issue here.
HOWEVER, its always a consideration, if its the right time to use the morph and NOT a waste of team resources. which it is in the hands of an unskilled player or under bad circumstances like "i meet the first skuttle"...