Pretty good, but not better than Lisa's Wedding.
Two things I disliked.
1/That they almost showed this future like 'canon' with the picture montage (hated Lisa experimenting with girls too). In a way, it's a simple introduction and less contrived than the other flash-flowards, but I don't really want to take any of this future episodes as canon, just different options.
2/The futuristic gags. I didn't liked them in Future-drama and still wasn't a fan of them here. I especially disliked the talking tree.
However this second point needs an explanation. I think SOME of the future jokes worked to some extent, especially those that were some kind of exaggeration of current things, like Lisa's daughter connecting herself to the internet (mails through brain were a little too much, though) or Grandpa being cryogenized instead of dead (cause that would have been more depressing, it's a good misleading joke with the tombstone and who knows, there's still a small chance that this could work someday). The airplane gags were also good.
I quite liked Bart's sons and their relationship with Bart and Homer, enjoyed Maggie's subplot and Lisa's was ok, though Milhouse wasn't very well used (actuallly not used at all) and for Lisa actually marrying Milhouse I think he should have evolved in better ways but he was still ugly and a loser, and Lisa would probably have better options.
Would have been an ok final episode but not perfect. However I really did like Homer forgiving Grandpa and helping Bart with his children. He really made up for all his lousy parenting after all these years.
4/5
