Saw the second to last and finale eps finally.
I suppose the best i can say is it was a decent ending to the series. Not great, not in keeping with the things that made the series one of my faves of the last decade or so, just good enuf.
Using the bits from Fringe cases past to strike at the Observers was a nice touch, but we had already seen that and seen it done better so it lost a lot of impact, imaginary razor butterflies aside.
Walter re-powering Liv was a nice touch, especially in how that was used against Windmark at the end.
Seeing the Redniverse again was well done. Neat how life there was actually better than in the Blueniverse now, and how the Observers had no trouble travelling there after Liv.
Massive glaring plothole not addressed in that if anyone could remove an Observer's neck-chip and power up, why didn't they just take one and re-power September. Sure, he was 'genetically experimented on' so it likely couldn't work, but even so it was handwaved a bit too easily.
Walter's sacrifice was trite but nicely handled.
Michael was actually the shining star of the finale, mindfucking Windmark right back again and telling Liv to shut up and let someone else figure out what to do.
The Jean guest apearance was pure win, but failed because they didn't use her as a living weapon against the Obs's in the last fight.
The last fight was nicely done, i just wish season had led to it more effectively.
The last scene with 'Etta was obvious, but at least a nice conclusion.
Overall this was only a decent last season to a great show, but i do take some solace that we got a conclusion rather than the cancellation that was repeatedly threatend. It's a bit of damning with faint praise, but there it is.