This isn’t really a discussion, but just some random thoughts for the OP.
I have seen maybe 20 movies that came out after 2000, only three movies in theaters (Lethal Weapon 4, Gladiator, Three Ten to Yuma). I find myself often going back to the safety zone of 80’s and 90’s film because there really are some masterpieces in there as you point out. Terminator 2 is perhaps my favorite action/Sci-Fi movie. Casino is probably my favorite film and I find it really easy to watch even several times a year.
I liked movies like The Big Lebowski, but it didn’t change my life (perhaps my sense of humor is off). Robocop is still kind of cool if only because it somewhat predicted the future.
Ocean’s Twelve is probably the worst thing I’ve seen in modern memory. Couldn’t even finish it.
The Dark Knight is probably the best movie of the prior decade and a true masterpiece, but I absolutely hated Batman Begins and The Dark Knight Rises.
Even an average movie like Ronin seems amazing compared to what I might have someone tell me I “must see”. The Departed was also really well done for what it was. I think the industry just ran out of ideas. I kind of feel bad for kids born in the 90’s, a little.
I just watched Inception last week. It was way better than I thought it was going to be. I liked it even and it took the next few days for me to figure out what I didn’t like about it.
Also, for the sake of stupid lists - 80s/'90s (not really in order, but kind of):
The Falcon and the Snowman
Buffalo 66 (yes, really)
Least favorite movie I remember seeing in the last 10 years: Garden State
Question for OP: Do you think Days of Future Past Worth seeing? I haven’t seen any of the X-men films but really like that storyline.