Someone that lives an impression. ENT came across as old, tired, and not really pushing the boundaries enough to make Trek seem new and exciting.
Couldn't possibly disagree more. Enterprise did things that had never before been done on any Trek shows including of course, DS9. From a Vulcan addicted to an emotion freeing drug, to a Starship with gaping hull breaches out of which flew doomed crewmen, neither TOS, TNG, DS9, or Voy had ever seen anything like this.
Except that from emotionally free Vulcans to drug addiction to crew members being blown out of bulkheads - Trek fans had seen it all before.
With emotionally free Vulcans you had Sybok from Final Frontier, and I believe Spock in one of the TOS episodes; you also saw Picard acting out some of Sarek's emotions on TNG, and I'm sure that Tuvok had at least one episode where he showed emotion/lost emotional control. And Trek had dealt with addiction before, the main example that comes to mind is Barclay's holo-addiction. Though I concede that we had never seen a Vulcan addict before, though DS9 and VOY gave us both Vulcan psychopaths ("Field of Fire" and "Meld"), which was perhaps more chilling. To be honest, I thought ENT botched that T'Pol storyline, the way it was written it came across like T'Pol was taking the trellium to experience emotion. It didn't make much sense. All she had to do was just lower her own self-imposed restrictions if she wanted to be more emotionally free. I always thought it would've made more sense for her to take the trellium to build up an immunity to it so that they could use it to line the hull, etc. I could see her wanting to be selfless and not deny the ship needed protection, and that she would be willing to put her health on the line. The side effect would be a loss of emotional control, which I would've made permanent.
I also don't recall seeing people being sucked out of hull breaches, however death during combat was something Trek had been dealing with from day one almost as well, and I think what is more important is how the characters react and/or how those deaths impact the crew and that's something that has been covered quite a bit. The visual effect hasn't been, but dealing with death has. I would argue that DS9 surpassed ENT in terms of having massive battle scenes, perhaps the only thing that came close on ENT was when Trip tried to prevent a Vulcan-Andorian war in the Vulcan Reformation arc. I was expecting a big Starfleet response against the Xindi weapon in "Zero Hour", but we didn't get it.
As for the Temporal Cold War, perhaps not as many episodes centered on it particularly but it cast a long shadow almost over the show's entire run, and for it to be so important, so influential, I wish the writers had fleshed it out better, had at least knew who Future Guy was. Though personally I wish they had just chucked it and spent that time laying the groundwork for the Earth-Romulan War.
I will say that ENT at least attempted to push the boundaries regarding sexuality. Showing T'Pol's backside in "Harbinger", and all those decon scenes, but it felt inorganic to me and gratuitous, which highlighted how the show was out of step with its contemporaries, which didn't exhibit too many hang ups about showing adults as sexual beings. I would argue that Archer's descent in Season 3 was a way the show pushed boundaries, though there had been examples of previous captains doing similar things, desperate measures tactics (Sisko with the Eddington stories and Janeway and the Equinox come to mind); however, with the backdrop of 9/11 and the War on Terror, Archer's actions might have had more societal relevance. However, I don't think the writers pushed it far enough, but I give them credit for at least having Archer continuing to be haunted by his experience in the Delphic Expanse in "Home".
I wonder if how each show would be perceived if ENT and DS9 could've switched places. The more I think about DS9, the more ahead of its time the show seems to me. I think DS9 would've worked better as a 21st century show, and I could see ENT perhaps fitting in a little bit more easily in the 90s.