Progressive metal done right naturally includes many different genres. They've always been doing that and I see no difference recently - ironically, say whatever you want about the album, but Systematic Chaos is the perfect example of this.
Ok then, list the many different genres that found their way into Systematic Chaos. I can give you Prophets of War but that's about it.
In fairness, what he's trying to get at is definitely right. It's
clearly not standard Dream Theater or else everyone would be fairly cheerful about the whole thing.
Forsaken is heavily tinged with Evanescencey or Nightwish vibes. The Dark Eternal Night has this really sludgey Mudvayne quality to it - the harsh vocals are
madly out of line with anything they'd done before. Or since. Repentance takes its cues, if anything, from Porcupine Tree - it sounds like Dream Theater doing a Porcy Tree song.
DT are naturally more upbeat (and manly) than Evanescence, more technical than Mudvayne, and more exuberant than Porcupine Tree, so they're not straight-up renditions, but I think they've taken on board a
lot of styles that are way out of their comfort zone. And many of their listeners' comfort zones.
Nobody ever complains that Systematic Chaos just sounds like normal Dream Theater. Let's face it, it's taken a bunch of risks. Riskiest album of the lot, potentially. As far as a fair chunk of the most critical sect of their fanbase is concerned (that's this place), it's a risk that didn't quite work out, but hey. It's way further off the beaten track than Black Clouds & Silver Linings. Or even Scenes from a Memory.
Incidentally, Train of Thought's starting to be reevaluated a bit now. Not
nearly as much
the Scrappy as it was a few years ago. Six Degrees of Inner Turbulence had a similar renaissance a few years back - I can remember when everyone would moan about how overwrought the title track was and how Misunderstood and The Great Debate were overlong and didn't have enough ideas and how could they follow up Scenes with something like Six Degrees and all that dancing. Give it four years and I doubt SC will be as scorned as it is right now.