I read all about the Spiderm4n situation, and if you heard what Sony was trying to force into the movie, you would be happy that Raimi quit. Sony was trying to even worse than they did with Spid3rman when they forced Raimi to shoe horn Venom into the movie. In this version, they weren't gonna let Raimi do as he wanted (even though there was an article about letting him have the creative freedom he wanted) as far as villains and something about a baby. Peter Having a baby? I'm not sure, but the movie was definitely headed in the wrong direction.
Raimi saves his reputation by walking away, and McGuire gets a lucky break(said doing spiderman was killing his back) in being fired from the move.
Why this might be a good thing though is that supposedly Marvel has a little more involvement this time around with the new movie. Some are thinking that Sony might try to get Spiderman an Avengers appearance even though the 2 movies should be releasing around the same time frame. Others are thinking that Sony is trying to capture that whole Twilight and Disney Teen crowd since the script is rumored to be pretty "gritty".
I say if they can draw from some of the best sources of Spiderman in HS, make sure that who ever plays if is witty and very sarcastic yet fits the Spiderman physique and Peter Parker look, and the guy who played J. Jonah Jameson on board, then it could be a good thing to re-boot it.
McGuire wasn't the perfect Spiderman and Mary Jane was hard to look at period. Not to mention SM3 was pretty bad, but Sony was pretty smart to have planned for this and not let the property revert back to Marvel.
Sony only has Spiderman for 3 more movies, but Disney/Marvel need to figure out how to get Xmen back from Fox asap.