About the only show I can think of where the final season was my favorite compared to earlier seasons is Angel. The change of scenery to Wolfram & Hart was a refreshing clean slate after the convoluted storylines of seasons 3 and 4, and addition of Spike to the main cast just plain rocked.
I'd agree that
Angel had a fantastic final season! Season 4's apocalypse took the Angel Investigations format to its absolute limits. Season 5 made the necessary but still gutsy change by moving the characters to Wolfram & Hart. At the same time, it was a limited format that ended exactly when it needed to. I feel like it resolved Gunn & Wesley really well. The deaths of Cordelia & Fred still hit me like a ton of bricks, even years later. My only regret is that we didn't get to see more of Spike & Illyria. (Well, that and I really didn't like what they did with Lindsey.)
I really liked the final season of
The X-Files but that's because I'm a huge John Doggett fan. I wish the show had lasted longer with just Doggett & Reyes.
Similarly, even though Seasons 9 & 10 feel like a different show, I thought Vala Mal Doran was a fun addition to the main cast in the final season of
Stargate SG-1.
I'll throw my voice in with the chorus of folks who loved the final season of
Star Trek: Deep Space 9. I loved Ezri Dax. I thought "Take Me Out to the Holosuite" was really fun. The Final Chapter was an epic conclusion. The only thing I didn't like was the whole Pagh'wraith/Gul Dukat thing. They made the Pagh'wraiths too EEEEEEEEEEEvillllllll at the end.
It's cheating because the show only lasted 1 year, but I'd say
Wonderfalls has a very satisfying finale for being a 1 season wonder.
I'm in the minority opinion here but I really enjoyed the final season of
Veronica Mars. Getting rid of Duncan lifted such a dead weight off the shoulders of the show. Some of the ongoing mysteries had kinda lame resolutions but the stand-alones were as great as ever. It was also kinda fun to see Keith Mars become sheriff again. And while it sorta ends on a cliffhanger, it's a really interesting one and not a terrible place to leave off (though many may call me insane for thinking that). I feel like I'm simply parting ways with Veronica as her life veers onto a new path.
Red Dwarf Series VIII was a very interesting reinvention of the series, resurrecting Rimmer & the rest of the Red Dwarf crew. The last few episodes kinda meander through a bunch of unrelated stand-alone skits but I love the final scene where Rimmer confronts Death. "You forgot, only the
good die young."
Dollhouse seems to be wrapping things up and going out at the top of its game.
Put
Star Trek: Enterprise &
Tru Calling in the category of struggling shows that were cancelled just as they were starting to get good.