I really liked seeing Clark come back, and I was pleasantly surprised at how effective the Puzzler's return was. I love her personality and the fact that she refered to her defeat during Ending Battle as "a standstill" had me laughing.
The issue's remaining villains, on the other hand, had me wanting so much more. After some absolutely fantastic appearances by the Prankster, Neutron, and Radion in the last couple books in this arc, I was expecting the villains in this issue to be up to par and shown to their potential, but instead, they're more along the lines of Metallo's appearance in terms of quality.
I'll admit that it was nice to see them in one place and being used as actual threats, instead of being locked in the creative closet at DC Comics as they have been since before the millennium (I'm not counting their wasted appearances in Ending Battle as "threatening").
First of all, the Silver Banshee had to be taken down off-panel because she (in all likelihood) could have easily killed Superman and ended the story right there. She'll probably recover and pop back up to resume the fight in Action Comics#839, but judging by this issue alone, her appearance is disappointing.
And Livewire flew straight towards the water flowing out of the dam? How dumb is she?
I'm glad that it was acknowledged that Hellgrammite was a very tough guy, but he shouldn't have been knocked out from the fall. He's taken punches from a fully powered Superman before and remained conscious (he's not nearly as strong as Supes, but he should still damn well be able to shrug off that fall).
And now Riot and Bloodsport...
Oy.
I have no clue WTF happened to Riot, but he's lost much of the fun factor he had during the 90's. What happened to the crazy little imp-ish man with the skull face and long hair who constantly argued with his copies? Now he's got a face that literally looks like a three year old drew it with a crayon. That's just stupid. Why try to change something that was just fine as it was originally?
Bloodsport had me cocking my eyebrow as well. Who the hell is this new guy and where's Alex Trent? Does this Bloodsport even have a teleporter? If he doesn't, then he's got no right to that title. He's already got a sure strike against him for using such low-tech weapons. Why the hell is he using bullets? What happened to the ultra high-powered blasters that were once synonymous with the name Bloodsport?
In conclusion, I really liked seeing the Puzzler, Superman and Clark's characterization and return to action. The other villains, however, left much to be desired. Why can't writers just bring back the classic ones without dumbing them down or drastically altering them?