Good Finale, though I would like to have more Lex, the whole interaction between him and Clark, was classic Lex (real close to comic book Lex). Wish they would have spent more time on the darkseid story and less on the marriage.
The way they ended the Lex story was great, good explanation of why Lex doesn't know CK is Superman. The classic theme music, with the bumbling Clark who then rips his shirt off to show the S was the perfect way to end.
About a movie with these characters, Not going to happen, there is already a new Superman movie (2012,
Superman: Man of Steel in the works and Welling wasn't even considered (Henry Cavill has the part). He (Tom Welling) has said he wants to play different characters, break out of the whole Superman role. Though there has been rumors of Marvel trying to woe him to play a superhero.
Overall, though there was was some campiness (Green Arrow destroying the 3 disciples with one shot was one) in the finale and the last hour was rushed, I felt it was a decent ending.