I started season 2 several days ago and here's some thoughts:
"The Lizard"
Thanks to the Helicarrier crash at the end of the final episode in season 1, Connors had to have his arm amputated. I was wondering how or if they were ever going to go that route with him. But now, he's lost that limb they could proceed with this story. I don't necessarily mind changes to the source material but here everything felt contrived. Connors has always been a biologist/geneticist so why turn him into some kind of a mechanical engineer? He's to Spidey as Q is to Bond. Always making his gadgets and what not. That really takes away from the Peter/Spider-Man character. Overall this episode was just ok. The team up with Ock was lame though and I thought the design on the Lizard wasn't very good.
"Electro"
Spidey's quips in this episode are some of the worst I've ever heard. I like how they first showed Electro in his star mask get-up from the 616 and then he changes into the solid blue design from USM. Another average episode though. And why is it, with the exception of the Lizard episode, that every final blow to Spider-Man's opponent is a slow-mo super strong face punch?? They don't show Spidey taking down his opponents in creative ways or using his intelligence to come up with how to take them down. Instead, it's "ok, time to end this," and BOOM, face punch. Enemy KO'd.
"Rhino"
This is a 'message to the kids' episode about bullying. It has a good message though. Flash is seen bullying a weak, smaller kid by the name of Alex. Peter and Luke notice this and attempt to resolve the situation. Alex becomes very angry after all the bullying and uses a special serum to turn himself into a giant Rhino-like monster and go after Flash for revenge. Spidey of course intervenes and saves the day. It was ok. I didn't see the need to totally change up one of Spidey's villains and again it comes off totally contrived. Different for the sake of being different.
"Kraven the Hunter"
Now, this was a pretty good episode. We get to see some history and development of Ava/White Tiger. Kraven is presented here in all of his badassness. The story was pretty good and the fight scenes were fun to watch. Spidey helping White Tiger to take down Kraven had some genuinely good moments and the end where they share a scene discussing the deaths of their father/Uncle was nicely done. Though it would have been nice to see them take things a bit further with Peter and Ava. There was a missed oppotunity to have them develop a romantic relationship or at least begin to show signs of caring for one another in a more loving manner. But no. For some reason Disney is against teenagers being together or having feelings like that...it's like teenage hormones don't exist. They had a nice opportunity to bring in that aspect here and do something original especially since they've completely neutered MJ. She even dresses like a boy.
"Hawkeye"
A team up with Spidey and Hawkeye against the Beetle. Spidey was a complete moron in this episode. Beetle is amazing though. I was kinda rooting for him to win during this one. It looked like he may have had a chance too until Hawkeye and Spidey do a tandem slow-mo face punch to take him out. Can't they think of anything better to show the villains being defeated?
"The Sinister Six"
This episode started off great. Ock uses Connors as bait to trick Spider-man into showing up at his underwater lab. Instead of showing up to help Connors with an experiment or something, Spidey encounters Ock, Rhino, Kraven, Beetle and Electro. Ock then transforms a tied up Connors into the Lizard. And there's your 6. I kind of like this line-up if I'm being honest. Spidey then makes an escape to the surface so he can call his team for help. What we're given is a battle between Ock's team and Spider-Man's team. It was boring and lame. The fights were so uncreative. At various points you have Ock and Spider-Man calling out orders to their respective teams to use to take down their opponent. It was painful to watch actually. Spidey kept yelling out for his team to use "combo moves!" Like, what the hell does that even mean? It was rather annoying. I never thought I would see the S6 make me bored.