ENT didn't "utterly fail" in its attempt to do something new. While a few episodes were faint copies of old concepts,
Much more than a few, and more than "faint copies." Many episodes were recycled plots from other Treks, none of them were particularly subtle about it, and at times they got a bit too blatant. Seriously, watch the episode Judgment and tell me you are not reminded of TUC multiple times.
That wasn't a copy, that was an overt homage.
There was too much copied for it to be a homage. It essentially is TUC redone on a TV budget. Plus, coming among the second season, which at that point was already under heavy criticism for reusing plots from other Treks or other sci-fi movies or shows in general. Hell, the episode Dawn was under heavy fire for being a near carbon-copy of the movie Enemy Mine, with several plot points which were already used many times in previous Treks. And then a month after that, they transplant the TARDIS from Doctor Who.
Not true, they didn't say that.
The audio commentary has the following paraphrased bit in it: "This episode came about one day when we had no ideas in the writer's room and Brannon just asked for anything, no matter how off the wall. I had this idea involving the Borg which I was holding in reserve for just such an occasion."
Not true. The lighting was much more cinematic than previous shows' flat, unrealistic lighting. For instance, there was much bolder use of extreme shadows and single light sources.
Honestly, I don't think too much on such matters anyway. I just remember when the cancellation was announced, Ron Moore going on about the show being filmed in the exact same manner as all the other Treks since TNG began.
Not true. ENT showed how Suliban hive settlements worked, how they related to Future Guy, and also explored how the Suliban homeworld was no more, causing a diaspora, with many Suliban settling peacefully on other worlds.
The Suliban were featured in 10 out of 98 episodes. Considering they were introduced in the pilot as the main protagonist, that's a pretty weak showing. Hell, in the end it seemed the mysterious Future Guy's plan was just to prepare Archer for the Xindi, and indeed once that's done the Suliban were essentially written out of the show, save for the Alien Nazi affair in season 4. Hell, even though Voyager abandoned the Kazon after the second season, they still did more with the Kazon than Enterprise did with the Xindi.
Denobulans were explored in the ep where Phlox met a race-enemy, and where his wife came on board. We also learned about their sleep cycles and natural defensive capabilities.
Thing is, there are only three times we see other Denobulans than Phlox in all Enterprise. Sure, we hear various details about Denobulan lifestyle, but compared to what we've learned over the years about Vulcans, Klingons, Betazoids, Bajorans, Trill, Founders, Talaxians and Ocampa we get practically nothing. Hell, out of all these races, Talaxians and Denobulans are the only ones we've never visited the homeworlds of. But at least we have the excuse of Talaxia being destroyed. Why didn't we ever see Denobula?