I did stop watching ENT a little more than half-way during its second season (first time I ever walked away from a Trek series). I kept tabs on it from this site and others, and came back for the fourth season. I do think ENT was a result of creator fatigue and interference from network/studio execs. I tend to think had the show had a fifth season, it would have become even better. I think it had more to do with the writers not really being technobabble experts, but using [TECH] as a placeholder for some device or whatever our heroes would need to get the job done. It may have been the show's technical consultant(s) who had to invent something "future tech-sounding" to fill in that blank in a script.