Actually, it's touted as an RPG. A stealth action RPG, yes, but still an RPG. But then the skill building in that game actually has an impact on the missions you do, so I would say it still stands as a better RPG than Fallout.
In a twist of painful irony, Deus Ex along with XCOM were the series that were luckier than Fallout and managed to retain most to all of their original charm. The games are the same genre with the same gameplay as their classic originals, with their own modern twists on them, and whatever drawbacks the AAA industry slapped on them (for Deus Ex it was the unskippable boss fights and prerendered cutscenes, for XCOM it was the linearity and lack of depth) was later fixed in expansions.
So while Deus Ex and XCOM stands proving that the AAA industry can still profit off making sequels faithful to the original, Bethesda sorts of completely ignores that school of thought, and just like EA's Syndicate, goes with the "make it just like every other game" route.