I disagree with the notion that Dukat was portrayed as the main bad guy or the "face" of the Domainion-Cardassian alliance in the final season. Dukat and the Pai wraiths are the main focus in like only 4 episodes in the last season. After the episode "Waltz" he pretty much stops being the primary antagonist as well as the "face" of the Dominion-Cardassian alliance and this is reflected by how little he appears in the final season. At this point he stops being a threat to the Federation and is only a personal threat to Sisko.King of Asgaard said:I wouldn't have minded that so much, but by that point, Dukat was no longer part of the Cardassian-Dominion alliance, so having him as the 'face of the enemy' doesn't make sense as much as, say, the female changeling. He's more like if Hitler was overthrown and went to the Orient to learn Firebending; it was just silly. It's especially aggravating considering it comes after his best episode, 'Waltz' which is such a great character piece for him.Deathlyphil said:Dukat was an amazing character. By turns heartless beast, and by others, a loving family man. I guess what they were trying to do with the war thing was to put a face on it. You can't mention WW2 for example without mentioning Hitler. He was the face of the Axis Of Evil, he was the focal point. Looking at most wars, there is always a hate-figure that we know about. However, the whole good/evil timeless prophets thing was a little odd... Technically, since time doesn't exist for them, they are both at peace and in constant war with the pa'wraiths forever.
Personally, I never really had a problem with Dukat allying himself with Pai wraiths. The end of Waltz pretty much made it clear that the death of his daughter left him unhinged and that he blames the Bajorans and Sisko for the death of her. Joining with the Pai-wraith was a way for him to get revenge as well as settle his long standing rivalry with Sisko. So given that he is mentally deranged and has motivation, him joining the Pai-wraiths isn't so far fetched. While I do believe Dukat's character in season 7 wasn't as good as it was in previous seasons and that he could have been handled better, IMO season 7 didn't ruin his character.
The final season might have focused on the Prophet vs Pai-wraith conflict a bit more than the previous seasons, but I never felt that they became the main focus of the the final season. The main focus was still the Dominion war and Dukat and the Pai-wraiths were more of an over arching sub-plot tied to Sisko.
LOL, considering Hitler's interest in occultism that description seems rather appropriate.King of Asgaard said:He's more like if Hitler was overthrown and went to the Orient to learn Firebending; it was just silly.
EDIT: As for the OP
Gone to soon
Firefly (duh)
Star Trek: Enterprise (while much of the series is bad IMO season 4 is where they had finally found their footing but it was too little too late)
Overstayed Its Welcome
Star Trek: The Next Generation
While I didn't think the last season was bad it was clear that by this point they had run out of ideas and were retreading old plots and themes. At least they were able to end the season and series on a high note.