I have a few problems with Unending.
Firstly, they rushed the Asgard's demise. That in and of itself deserved a whole episode. And if they were ****ed anyways - why not go out fighting? Take their whole mother****ing fleet and attack the Supergate.
Secondly, the Asgard had presumably tested the Core before fitting it to the Odyssey - so why didn't the Ori attack Orilla? And if the Asgard could defend Orilla against attack, why not just get the Odyssey to move within range of their defences.
Basically, I don't like how the Asgard were removed from play so rapidly when even as a bunch of half-rotting corpses they still could've done ****loads to help against the Ori.
Thirdly, why didn't Daniel and Vala have a child? I assume the reason she was crying in that flash-forward scene was due to a miscarriage. But if they'd actually had a kid, it'd've added more conflict to the decision to reverse time, and they could even have had the kid being the one who was isolated from the time-reversal.
Fourthly - **** sending Teal'c back. Carter was a WAY better choice. She was the only one with any technical knowledge from the soon-to-be-useless Asgard Core, and could've cut decades off the time needed for Earth to reproduce the Asgard weapons systems.
Fifthly - why not use the Asgard Core to replicate everyone and transfer their consciousnesses into young bodies? They could easily have saved Landry.
Sixthly - why not give Teal'c a whole sackload of data crystals with as much information from the Asgard Core as he could carry?
Seventhly - why not just ignore the fancy ****, find out how to build a ZPM and restore the shields?
Eightly - why not just replicate a ton of the Asgard carbon/trinium/naquadah alloy used in the construction of the O'Neill class ships and leave like 50ft of it in the path of the Ori beam weapon?
Ninthly - why not just spend 10 years restructuring the ship so none of it was in the path of the Ori beam?
But on the plus side, it was - I suppose - a fairly decent idea. Even if they did botch the implimentation.
I just don't like that they killed off the Asgard, effectively took the Odyssey out of play (by making it too valuable to ever risk on a mission again, even if the Asgard Core can't be used) and knocked 50 years off of Teal'c's life - and the only positive was that they destroyed 2 Ori ships.
Oh, but I do like that they indirectly said that Asgard technology was superior to that of the Ancients.