Gonna write about the Scream series as a whole, from start to finish this might be the most consistent slasher series ever, even the weak link Scream 3 when watched as part of the while series works. In fact, I'd argue Scream 4 redeems Scream 3, 3 does not work as the finale of the series, which 4 absolutely does. The subversion in 4 is top notch and would not have existed had 3 been done as Williamson originally planned. Williamson reused his originbal ideas that he never got to do in Scream 3 (as he didn't write it) for Scream 4... and those ideas work much better in 2011 than they would have in 2000.
What really hit me watching them all together is that Scream is the only slasher series that is truly and utterly about the Survivors and not the killer.... they are the unkillables that just keep coming back. That's what makes Scream so special, Sidney (who I'd argue is the greatest final girl in slasher history, watch her character progression, her strength in each film, she goes from innocent girl in 1 to battered but trying to move on college student whose judgments are influenced by her pas trauma in 2 , to recluse but trying to use her pain to help other women in 3, to someone who finally found herself in 4 ), Dewey and Gale, get their asses kicked in every film, they get beaten, stabbed, shot... but they don't die... the killers are mere humans the surviving trio are the superhumans. It's brilliant, because Craven never made you think they couldn't, 3 set them up to do so and the hype build up to 4 in terms of press and what not screamed that Emma Roberts was going to be positioned as the new MC, to build new movies off of.
When you watch Scream 3 as part of a whole it serves it;s purpose (more so than Williamson's original 3 idea... which I;d have loved to have seen don't get me wrong, look it up there's some cool ideas, some of which he used in 4 and some he didn't), but this 3 while less violent and more comedic actually wrapped up Sidney's core issues, we got closure entirely on the Sidney's mother thread. The reveals there work, and frankly Williamson wanted to go back to Woodsboro in ... which is too early, going back instead in Scream 4 years years later works so much better. The escalation from small town (1), to college town (2), to Hollywood (3) is pitch perfect, especially with the furthering of the movie within a movie concept introduced in 2... setting 3 on the set of the third movie within a movie set is solid escalation of that concept introduced in 2. I'm kinda just rambling, but this is the series that opened my mind to the horror genre so I have a lot to say about it. Anyway like i said Scream 4 retroactively makes 3 have a better place in the canon, returning to Woodsboro, 15 years after Scream 1 rather than just 3 is more meaningful., the contrast between 3 being Hollywood back lots and 4, a return home is more meaningful.
Finally the lack of gratuitous sex and nudity in the series is wonderful. Sticks to what's important, gratuitous death and violence ;)... but legit nudity for the sake of nudity is a frustration I have with slashers.
All in all I spoke little about 1 and 2, but that's because there's not much to say, they are classic of the genre for a reason. I love this series.