SM3 even without the memes has some merits. The sandman introduction, with no dialogue, is a great scene with how its done. The fight scenes work pretty well, and I think it had some good ideas but the hype got to it. Nostalgia Critic explains it pretty well.
TBH, the Raimi trilogy has spawned so many memes but it is not just SM3.
ASM 2's problems can be summed up as this: It was obvious they didn't learn from SM3's issues. Too many villains and sub plots but nothing actually brought it all together unlike SM3 which was built up prior; some of the ASM 2 plot was totally new or...redundant, or missed. Besides the Peter-Gwen dynamic, which is still good to watch and actually cute, there was a lot that didn't work. And whatever ASM 2 did new...was usually in the work of franchising I felt, like doing the Sinister Six stuff.
I do not hate the film though because most performances are good, action works, Garfield is still a great Spider-Man on his own terms, and I can tell it was mainly Sony AGAIN fucking them over. Calling any of the Spider-Man films the worst isn't as bad as it is with something like Star Wars, where there are so many and MANY of them are divisive on their own. No Spider-Man movie ever got below I think a 7.5-8/10 I think except for ASM 2.