I think Namor can carry a title, his quality is not the issue but the quality of the writer. He has had a 4 year run, two 5 year runs, a 7 year, a 10 year run, and a 14 year run. He was in the Defenders and Invaders for 8 years straight and then had a three year run with the Avengers and two more one year stints with the Invaders.. He has had about 350 solo issues and over 100 with teams. Who beats that? Hulk, Spidey, Avengers, X-men, Daredevil, Ironman, Cap, Thor. Nobody else really?
He has just been badly written over the past decade and dont even get me started on that baby Namor book they did a couple years ago. What a horrible concept. Something that plagues Namor is that no one that writes him ever knows anything written before.
If a writer actually compiled all the powers Namor has been shown to have... how powerful would he be?
He is listed as being class 100 strength that deteriorates as he dries out but he has that suit that can keep him wet.
He is pretty invunerable as is but also has his Atlantean armor from Neptune which bolsters his invunerability and strength.
He also has Neptunes Trident which allows him to control water, create water elementals, earthquakes, tidal waves, rain, fog etcetera.
He has a limited ability to control marine life, sonar and can create electic blasts light an electric eel.
He can also absorb other forms of energy and use them as electric blasts. He has that horn that gives him total control over all marine life.
He can make mental projections and the Sword of Kamuu is as powerful as the Ebony Blade and can negate any magic even that of Dr. Strange, it also make him stronger and enchanted.
He can fly and has heightened sences and reflexes.
He also has the magic earrings that let him telepathically comunicate with the wearer of the other, Narmorita had the other, RIP
And he has an entire army and has been a member of the three premiere non-mutant supergroups: Avengers, Invaders, Defenders.
But nobody ever writes him using any of this stuff.
With the upgrades from the Trident, Kamuu, wet suit and armor he has got to be Hulk/sentry type strong. Immune to magic, control of water, weather, energy manipulation. Wow... can you imagine if he were written with all his powers. No wonder he's so arrogant, he knows he's the best.
I think he'd probably be the most powerful non-cosmic character and stronger than a lot of them. You cant tell me this character doesnt have the potential to carry a title. I have to agree that he needs an A-list writer that will research or needs one of the old dogs from the 60s and 70s that actually know the character.
t:
Namor throws down with Venom!!! 
