I agree that many of you are taking the most disappointing and labeling it the WORST. To illustrate, let's look at some of your choices:
Spider-man 3: IMDB - User Rating: 6.7/10 (89,970 votes)
Pirates of the Caribbean 3: IMDB - User Rating: 7.1/10 (75,688 votes)
Shrek 3: IMDB - User Rating: 6.3/10 (29,397 votes)
Live Free or Die Hard: IMDB - User Rating: 7.7/10 (68,797 votes)
AVPR: IMDB - User Rating: 6.0/10 (5,955 votes)
Now, I am not trying to invalidate anyone's opinion. If you truly think one of the movies above sucked, then that's your right and your opinion. I just put the figures up to illustrate how people's emotions are blinding them. Read the postings for those movies above ... most of them aren't descriptions of why a movie was bad ... they are pure hate. Sure, hating a movie may make it "worst" on your list, but it's not an honest rating. For example, if Spider-man 3 was the first film, no one here would label it the worst film of 2007. I am sure there would be comments like, "well, it wasn't as good as Batman Begins, but it's a decent beginning. Lets see where they go from here." Same thing with POTC 3 and pretty much every sequel you guys listed. But, the first films were so amazing, their average sequels don't stand a chance in your eyes. So, in the end, I agree with Dave. If those are the worst films you have seen this year, A.) you guys must not watch many movies and B.) I feel luck for you.
My worst film of 2007? Daddy Day Camp -
https://www.imdb.com/title/tt0462244/ - I let a female friend talk me into going to see that excrement at the theater. I wasn't expecting Shakespeare, but expected TBS level entertainment from an OSCAR winner. Cuba should have to return his statue for being in that film ... ugh.