No, not at all.
The bosses are different levels, varying, depending on which planet they're on.
Like the world boss ''The First'' on Dromund Kaas, is made for a raid of people around level 12-15 or something like that.
The one we killed on Narr Shaddaa was level 31 and dropped loot around level 29-32.
Another noob question. How do I find them? I dont remember see a quest for "The First" or did I miss it? I'm level 20 now and on Balmorra.