Well, it could have been better, but given the budget constraints they had, I found it a good ending to the show. One I have personally watched every episode of.
Things that jumped out at me:
-So Chloe is Speedy's mother? Is that what they were hinting at there when her little boy looked over at the red and yellow bow and arrows? And Green Arrow's love child to boot? Interesting.....
-Would have liked to have seen more Clark in a well designed Superman suit, but that probably would have blown their budget. The Brandon Routh suit wasn't cheap from what I recall from my Superman Returns Special Edition DVD bonus features.
-Would have preferred full blown Darkseid and not just a possessed Lionel, but ok.
-Superman inspiring the people which in turn repels Apokolips, hmm ok. When they talked about that I figured thats how it would work. But Superman pushing the entire planet away? No thanks. Thats too Pre-Crisis uber-Superman for me.
-The end seemed kind of compressed and thus overly melodramatic. Too bad Warners couldn't have given them a real big budget and essentially made the finale the new Superman movie. That said, I'm looking forward to the new movie.
-I liked how they worked in Lex losing his memory of Clark's true identity. Sucked for Tess. Her character had really grown on me towards the end of the show.
-Finally, whats the deal with the CW cutting away during the John Williams theme during the final credits to show a freaking Gossip Girl preview?! Come on! I invested 10 years of my life into that show. Let me at least watch the entire credits and listen to the classic John Williams score.