The plot of "All Good Things" is not anything earth-shattering, but that's OK. The writers and producers tried very hard to pay tribute to Star Trek the show - to the characters, the relationships between them, nods to previous adventures - and provide fitting closure to the series.
The pre-Farpoint crew is really, to me, the highlight of the episode - the goofy uniforms, Data's extreme naivete, O'Brien back at the helm. Whereas John DeLancie's Q was ridiculously over-the-top in "Encounter at Farpoint", we get a more sophisticated reading here. He all too knowingly mocks the Enterprise crew and even the premise of the show in a sequence that never fails to get a chuckle out of me.
And Patrick Stewart - well, he gives the kind of superlative performance we'd expect.