I've just finished watching Superman Genesis.
I really enjoyed the Smallville stuff at the start, nearly everything that was left in made sense and it was very well edited and well paced.
The middle section though I'm afraid I have to agree with bionicbob. The romance between Clark & Lois just didn't work, it was way Way too quick. 1 minute they meet for the first time, 10mins later he's declaring to Lois that she's "The One" and a minute after that they both saying "I Love You" and they're in the sack together. Like bionicbob I felt more scenes were needed to flesh out the romance.
The last section was better but again I agree with bionicbob that the continuity was stretched a little bit too far for me with the Darksied stuff, though the Apokolypse scenes I liked.
The one thing that I did dislike was the new score, I'm sure some people may like it but I didn't think the arpeggiated synth worked at all (Especially during the Funeral Scene) and that it was used way too often, along with the Inception style score.
It felt to me the editor knew exactly what he wanted to do with the Smallville Scenes at the start (ie replicate the Movie, which I agree with) and knew pretty much what he wanted to do with the ending but he was so keen to get to the ending he rushed the middle of the edit just to get to it.
I mean the 1st Superman movie clocked in at around 2hrs 40mins and Superman 2 was a bit over 2hrs. But Superman Genesis on the other hand comes in around 90mins and I don't understand why the edit needed to be so short considering how much story there was to get through.
Overall I think it was an amazing effort and I completely respect Superboy's achievement but having just recently watched Q2's edit Northwest Passage of Twin Peaks I feel Superman Genesis just needs more meat on it's bones. But what it does prove is that Smallville can be edited to make a great movie, though it'd probably be better as a Two Parter or Trilogy where each movie is around the 2 hour mark.