I was wondering where the Star Sapphires were, plus any Blue Lanterns, not to mention Mogo, since if the universe is about to end, why hold back. But that's OK. I thought the pre-Big Bang Cosmos was utterly awesome, with such clear and suggestive symbolism. To wrap it up in 30 minutes, it had to be done quickly. They should have found a way to make this an hour showdown by lopping off some other episode earlier in the season. The reveal that not only was Aya alive but she was still emotional was played out well considering, but, yeah, with a message of Love Conquers All, the Star Sapphires especially should have been there. Nevertheless, I thought GL's finale was among the finest 30 minute TV show cartoons I've seen.
As for the YJ finale, it was OK. I'd noticed that the animation had gone downhill near the end of the run, which is understandable I suppose, but it's still kind of unfortunate. Finally seeing Darkseid was nice. In the long run, I'd wonder whether Dr. Fate could do something about Wally, especially given their history together. Good to see it go out on an overall uplifting note for the team, despite the tragedy.
And to reiterate, I'd much rather see the continuation of either of these shows, but especially both, instead of the new Teen Titans or another Batman show. Oh, I'll probably watch their premiers, but it won't take much for me to bail.