Shadow Broker.......Harbinger.....Sovereign.......Illusive Man.........what is this, Gotham? Or The X-Files? All we're missing is the Cigarette Man and the cheeseburger-munching Hamburglar.
Get serious plz.
This actually always made a lot of sense to me. For example, the reapers never gave their names, so the protheans named them for what they did and that was taken over by the races today. Sovereign and Harbinger were clearly "misunderstandings" if you will.
When we first meet Sovereign for example, he says "I am sovereign!" We learn later that his name was actually Nazana, so this was not a name, it was what he felt he was -> sovereign (probably introduced himself to Saren the same way and he took it up as a name).
Same with Harbinger: "I am the harbinger of your salvation through destruction".
So no, I have no problem with those kinds of names, as long as they are not used for something that would give itself its own name already (such as races and their home/colony planets). So far, I think ME did fine with the naming and it looks like they'll keep it up in this way ("Khet" is rumored to be the name of a reace that lives today -> can name and introduce itself, the "Remnant" is probably the name of an extinct race, the original name of which we don't know -> we use a descriptive name).