The BIG advantage of EW is that even the lowest Tier has more decent damage and properties (traits/perks) than the equivalents in other categories.
The other advantage is that the ammo diversity is very small (3) - every rifle will use MF cells, and Pistols will use small cells or electric charges (SMG).
EW are medium range and most of them (Magneto Laser pistol, Plasma pistol) can still be used quite well in late game (not always true for Small guns and Big guns).
Most EW players stick to Laser Rifle because it is cheap, has great range and for aiming with accuracy, and damage. You can also use electric or plasma weapons, where armors have lower protection.