You're completely making this all up. I never saw any articles talking about Rhino being ruined or "Why is Electro blue" those are such ridiculous article titles that I know they were never made. Nobody was screaming for Marvel to get the rights until the movie came out, was bad & Sony panicking pushed Sinister Six to TASM3's release date.
Norman's head being in a jar wasn't revealed until TWO months before the movie's release from a leaker on Reddit, nobody knew about it before March 2014 so how could they have hated it? And just like Ganke in Homecoming, many people were onboard with the idea of Harry being a Goblin before Norman. I was too because of how it could've set Norman up as the ultimate enemy for Peter: by setting up his own son & having him do his bidding. Everybody back then thought Harry was going to be a "Proto-Goblin" to take Spidey's blood for Norman & we were onboard with it until the movie came closer & they started calling Harry "Green Goblin" and then the movie came out & they had Norman die in his first scene. THAT'S what fans hate it, when they saw the actual movie. Practically EVERYBODY was onboard with the idea of Rhino being a mech because it separated him from the Lizard as being another cross-species & he looked awesome in Ultimate Spider-Man. When the first pics of Rhino came out, people were mixed (I didn't like it) but when we saw the movie, that's when we knew they ruined Rhino & made him a terrible cartoon character. I'll give you this. It didn't prove naysayers who already hated the reboot from the start because they were mad Raimi's seried got canned, when it came out, that's wheh everybody turned against it. It did have s huge following, though. More than TASM1 & showed when it bigger opening weekend than the first. But word-of-mouth sliced off it's legs & it underperfomed.
Nobody did except people who hated the first movie & angry Raimi fans. The former being the minority because the first movie WAS received well by critics & audiences alike. Everybody thought it was going to be a huge success: everybody thought it was going to be the first billon dollar Spider-Man film, including Sony. There was no "Bring in Marvel" until Sony showed their ***