When I saw the finale of the Xindi story, and we got that shot of the alien nazi, I laughed.
Well, that was a far better response than I had. There I was, watching the season finale of what started to be a much better season of ENT than what had come before, the Xindi arc was finally concluded, and then the final scene shows some alien in an SS uniform? WTF??? I can truthfully say that I was extremely pissed off. I went to bed with all kinds of unhappiness that night.
THIS, THIS, THIS! I was SO angry, I couldn't sleep! I told my wife, "F-ing Space Nazis! Star Trek is dead!" Glad I was wrong about about ST being dead.
I was SO turned off, I didn't bother to watch season 4 until that weird syndication package a year later that only showed about 65-75% of the eps from season two and a few season 1 and 2 eps. That was plain WEIRD, however, it was enough to wet my appetite for more of season 4. I did eventually see season 4 on DVD and found it better than 1 or 2, maybe a fraction better than season 3 overall.
However, as mentioned above, season 4 did include the idiotic Space Nazi wrap up and the unforgivable misfunctioning halodeck dreck/"Valentine" TATV.