» Tue Jun 19, 2012 3:25 am
It all depends on what level you were when you met that companion.
Companions are supposed to scale with you, but a bug causes them to stay whatever level you were when you first met them. This means that as you level up, stronger enemies start to spawn so you still encounter opposition, but your companion will stay as weak as ever.
So if you met J'zargo when you were level 30 and you go out with him to fight enemies when you're level 50, you're going to have him facing enemies that are intended for a level 50 player to fight. He'll get slaughtered. This can be fixed on the PC version though by using "resurrect 0" on a companion, which respawns them, complete with correctly-scaled stats to match your level at the time.
I do find a properly levelled J'zargo to be an excellent companion, however. His only downside is his annoying refusal to use better robes than what he's wearing. I gave him Master Robes of Destruction and he still wears his Novice Robes.
Personally, I believe the best companion in the game is Cicero, who can be obtained as a companion if you spare him during the Dark Brotherhood questline. He's one of the few companions that isn't awful at sneaking and he also comes pre-outfitted in some really good equipment.