Best Remake
The Italian Job
I just love this movie, saw the original after but regardless this movies so much fun!

Worst Remake
The Pink Panther
What a disappointment, no one should of attempted to relive peter sellers' role, never!

Best Sequel
Spider-Man 2
Great movie! great sequel! Oh kirsten dunst
Honorable mention to Toy Story 2!

Worst Sequel
The Blair Witch Project 2: Book of Shadows
You don't do a sequel to a indie classic, it just wont work!

Best Remake: Scarface (Tony Montana lives on)

Worst Remake: Psycho (others explained why)

Best Sequel:  Harry Potter and the Chamber of Secrets (primarily because of the guy who played Dumbledore)  

Worst Sequel: Blair Witch Project 2 (how can you do a sequel on something already proven false?  this shows the consequences)

Gabe

Best Remake: John Carpenter's The Thing (I think it's self-explanatory)

Worst Remake: The Hitcher (why???)

Best Sequel: I was going to say Godfather II but I'm gonna stick with Alien³- extended version (character development galore and it's still way better than Aliens)

Worst Sequel: Star Wars: Episode I - The Phantom Menace (Jar Jar Binks anyone?)

Best Remake: THE FLY or TEXAS CHAINSAW MASSACRE

Worst Remake: One Missed Call - one of the sloppiest movies i've seen

Best Sequel: Nightmare on Elm Street III - Great characters, inventive, entertaining or New Nightmare - A solid original sequel and a great way to celebrate the 10th anniversary of the original

Worse Sequel: The Hills Have Eyes II (sequel to remake) - Had so much potential...lazily done...completely useless

Underrated Sequel: Halloween II  and also I Still Know What You Did Last Summer - I think people are too hard on both of these sequels. They both are substantially better than most slasher sequels that'd you see. and very entertaining

BEST SEQUEL EVER

I wholeheartedly agree!

Let's see if I have a couple that haven't been mentioned.

Best Remake: Lord of the Rings (Have we forgotten the animated versions that predated Peter Jackson's?)

Worst Remake: The Hills Have Eyes (Sure, you write about the worst that could happen, but not the worst decision one can possibly make; and you run into a camper and fail to notice via peripheral vision that your daughter is being raped 5 feet to your left? Seriously...)

Best Sequel: The Empire Strikes Back (George Lucas' ideas with someone else writing and directing them; what bliss)

Worst Sequel(s): Friday the 13th Part 8 (actually most of the Friday sequels are pretty horrible; a vision of idiotic characters doing idiotic things just to get killed -- but this one ranks as the worst of the lot) & Scary Movie 2 (I can't think of a worse movie, period)