Why are our characters mightier than the Maia? When did we best a Maia (solo or even in a raid)? As far as i know, Balrogs didn't belong in Maia.
I haven't yet fought the last chapter of the Tower of Orthanc raid, as i think this is what you're reffering to. But do we really beat Saruman with only 12 people and not the help of anyone else?
Compared to Legolas and Aragorn we're unbelievable. We're superheroes among these mere mortals. We slay dragons, we slay trolls by the bucket load. We shoot lightning from our fingers, we wield awesome weapons and are festooned with magical jewellery, we face down Saruman and slay super-dragons, demons and balrogs (with the help of our Super-Friends), we slay more uruk-hai than it took to take down Bormir while AFK making coffee. We are super-awesome. We're not 'some guy' that slip people's memories.
Half a dozen of us, so long as we had a Warden a Minstrel and a Hunter with crit chaining rain of arrows in the team, could have held the hornburg on its own from Saruman's pathetic bunch of orcs probably. If we're not Maia w're the next best thing.
My point is it's no use twisting and bending lore to say we might have been there, sitting inconspicuously in the corner somewhere. We're about as inconspicuous as Liberace headlining Vegas.
We're in a Middle Earth where orcs and uruk-hai barely cut it as cannon-fodder. Sauron's forces are chocked full of stuff, from trolls to demons that barely get a mention anywhere in Tolkein and the super-heroes swarming all over the place are the forces for good's equivalent.
None of it fits lore so I'm not going to get in the slightest bit upset with being in Helms Deep.