| > Well the whole memory thing is no different then Tony Stark doing it in Iron Man|
Yes it is, because as far as I know, Tony's move didn't alter his personal relationships all that much, whereas this one has immediate effects on Spidey's supporting cast--family, friends, and enemies.
| >or Superman kissing Lois at the end of Superman II |
That move invalidated the previous two hours (real time). This one invalidated the previous 25+ years.
| >or more recently Clark to Chloe in Smallville. |
As I've commented elsewhere on the thread, this is comparable to the Spidey retcon. That show always was a mess in terms of continuity, and it is even worse now.
| >Doing things like that I'm usually disappointed in because it means taking those characters back to an interpretation before they found out about the main character. |
| >It is possible for them to still tell interesting stories about the main character though and even ones about the supporting character that lost their memory.|