I can't say that I've ever liked Disturbed to begin with, so what direction they choose to take things in doesn't really make any difference to me.
With that said, I listen to music because it's good - it doesn't matter how "Metal" something is or whether people perceive a band to be "Metal", I listen to things because I like them. In point of fact, a lot of the metal bands I listen to are intriguing hybrids that would almost certainly fall into the OP's classification of "Metal that's not Metal!" - I've generally found that caring about "how metal" a band is and using that alone as the criteria for determining if you should like them seems to be something Thrash fans concern themselves with more than anyone else; me, I don't even really like Thrash very much.
If worrying about how "Metal" something is means missing out on unique gems like Beyond Twilight [http://www.escapistmagazine.com/forums/read/326.206266-Gildans-Guide-to-Good-Music-Beyond-Twilight-Section-X], Guilt Machine [http://www.escapistmagazine.com/forums/read/326.188932-Gildans-Guide-to-Good-Music-Guilt-Machine-On-This-Perfect-Day], Katatonia [http://www.escapistmagazine.com/forums/read/326.209418-Gildans-Guide-to-Good-Music-Katatonia-Night-Is-The-New-Day], Orphaned Land [http://www.escapistmagazine.com/forums/read/326.188243-Gildans-Guide-to-Good-Music-Orphaned-Land-The-Never-Ending-Way-Of-ORwarriOR], Penumbra [http://www.escapistmagazine.com/forums/read/326.194210-Gildans-Guide-to-Good-Music-Penumbra-Seclusion], Todesbonden [http://www.escapistmagazine.com/forums/read/326.202100-Gildans-Guide-to-Good-Music-Todesbonden-Sleep-Now-Quiet-Forest], and Virgin Black [http://www.escapistmagazine.com/forums/read/326.196425-Gildans-Guide-to-Good-Music-Virgin-Black-Requiem-Mezzo-Forte], or sneering at the likes of After Forever [http://www.escapistmagazine.com/forums/read/326.212622-Gildans-Guide-to-Good-Music-After-Forever-After-Forever#7191330], Allen/Lande [http://www.escapistmagazine.com/forums/read/326.197675-Gildans-Guide-to-Good-Music-Allen-Lande-The-Battle], Octavia Sperati [http://www.escapistmagazine.com/forums/read/326.195079-Gildans-Guide-to-Good-Music-Octavia-Sperati-Grace-Submerged], or Within Temptation [http://www.escapistmagazine.com/forums/read/326.193866-Gildans-Guide-to-Good-Music-Within-Temptation-The-Heart-Of-Everything] because they "aren't Metal enough", than I say screw that!