Agreed, that and Goblin, literally just in there for:
It could've been handled better.
That still is a lot more reason to be in there than either Electro or Rhino though.
The whole parent-oscorp thing ruins the entire plot of both ASM1 and 2. It's really sad because between those two films, there could've easily been the one best spider-man film so far.
If you fuse ASM1 and 2 throw away the parent thing, open the film with him being bitten, put in the Goblin and the Lizard as a guy that Harry (or Norman) tries to push into making a healing serum for himself because his dad is constantly ****ing him up with dying (more scenes between Norman and Harry damnit). Then the Lizard would've somewhat had the role Electro had in this film, but smaller, because he needs less of an origin - he's simply a doctor being mistreated (non nonsense 'whole city becomes lizard' BS. Just a good nature Connors being misused). Lizard as a sidevillain to have a little bit more action except just with the Goblin and to tie the thing into Oscorp and the reason Harry becomes the Goblin (maybe Norman actually tests the serum out on his own son!?). Maybe this time it's the Lizard that kills Ben for example and Peter realises he should use his powers against enemies like this.
I dunno, either way, if you fuse ASM1 and 2, keep Lizard and Goblin as the two enemies (in more traditional designs), do away with the parent thing and just focus on Peter dealing with Gwen, Harry and Norman and Ben dying (maybe in a flashback if you wanna start the film with spider-man already existing, like asm2 begins), have Goblin and Lizard as the two villains, you'd have had the best spider-man film to date I'd say.
But the parent subplot, Electro (and the tonal issues he mostly is the cause of) are all completely unnecessary to me.