Horses for courses, but S5 has it all. In the lead up, you’ve got Buffy going catatonic; then a road trip where she’s fighting on top of a motorhome.
In the final episode, there’s the planning (Anya pointing out the hammer and the orb) to the sense of doom (“We few, we happy few… we band of buggered!”), Willow rescuing Tara, Spike failing, Buffy bot tricks, Xander with a wrecking ball, Buffy pounding Glory, Giles finishing things off, Buffy pushing Toad-face off the tower and then making that jump. Followed by the scenes of them all reacting. Then “She saved the world. A lot.”
S7 was let down by the deeply shit Willow Ex Machina.
S3 was big fun but stupid because the evil demon’s plan to take over the world could be stopped by explosions. So his plan for world domination was faultless as long as he didn’t come across any armies.