I dont think I can fully answer here assesment on Origen, but few notices,
Its can of worms to answer who has more orthodox writings. As far as Theodoret is concerned, problematic things are only his treatises on Cyril, which are not that voluminous, he wrote a lot more besides. As far as Origen... well is there any work of him, without problematic passages. Its not just De Principii... He held subordationist Triadological views, for example in commentaries on John's Gospel. But it is can of worms.
Second, hm... he did influence Saint Athanasius, but he did influence Arius to. And two Eusebiuses, and so on. Capadocian Fathers were recipients of Origenistic tradition, but only Saint Gregory of Nyssa was Origenist, in true sense. We could also invoke example of Tertulian, he influenced a lot people, who called him master, but he died heretic.
Now, to stop analogizing, authority of Saint Photius is quite good enough, as far as EO tradition is concerned. How strong, Photios words are taken, is shown from fact that liturgical comemoration of Clement of Alexandria ceased, because Photios did not considered him saint.
My intention was not to stear up, Dyophysite-Miaphysite discussion :-) (U dont imply you understood me such, just clearing)