BG and EW really must be rare weapon, also look at thier varieties. EW: laser/plasma pistol/rifle ...that's all, gatling, as I know, almost noone want to use, because of MFCs wasting. BG... rocketlauncher and various support weapons. That's all... because everything developers took from standart Fallout (of couse...), but in FOnline having high skill in BG and EW, but min. in SG is normal... In standart Fallout it's normal only if you "cheating" by going to NCR from Arroyo and stealing bozars, then, of couse, you don't need SG skills, but standart Fallout (Arroyo->Klamath->Den->Modoc, etc.) means, you'll see first BG/EW at late game, and it MUST be more powerful, than SG.
In compare with FOnline... you can craft rocketlauncher (which is very rare in standart Fallout) on 1st lvl prof... flamer without prof, and for minigun 2nd prof. That's really-really easy. As I can remember from Fallout 1, the first time, when you can have laser rifles is 2 Super Mutants near entrance of Mariposa base, it's almost end of the game...
So balancing such weapons for FOnline you don't need to see standart Fallout's weapon characteristics. Devs should remake every weapons' stats for thier game, because it's not like standart Fallout.
So it's kinda "normally" that SG is weakest weapon type, because it considered to be common weapon, and BG and EW advanced weapon. The only thing, which kills EW is armor resistances vs laser, so logically BG must be the best choice for FOnline for now.