Double eye Obito also doesn't have the woden homonculus body boosting his reserves like crazy, so he'd actually be weaker than normal Obito.
But assuming he still has those powers, then the fact remains he can't combine his eyes, because he must deactivate all techniques when using the phasing ability.
With that in mind, anyone with better reactions, clone feints or continuous attacks still beats him.
So most Akatsuki, Kage, Golden Gen and legendary shinobi beat him.
All the second eye gives him is a long range option against enemy attacks, which is hardly much at his level anyway.