I've heard Politics of Ecstasy and seen Nevermore live twice. FF and Nevermore are really nothing alike. FF of course has the industrial type futuristic machine sound, while NM is power thrash or something. FF's vocalist is also a lot more guttural at times, and his clean voice isn't near as power metalish as Warrel.
FF just gets a bad wrap because people like to concentrate on their worst album, Digimortal (it's not that bad), and ignore their two best, Obsolete, and the utter unfuckablewith classic Demanufacture. Neither Meshuggah or Nevermore have released something near as important as Demanufacture.
FF>>>>>>>>>>>>>>Meshuggah>Nevermore
EDIT: Hell, even Terrorizer recognizes FF's importance, citing 3 of their albums as some of the most important albums of the 90's. Meshuggah got 1, Nevermore got zero.
And on the Terrorizer reader's poll for the best 90's albums, Demanufacture got #4, only behind Emperor's Nightside, Metallica's self-titled, and Emperor's Anthems.