Miracle, I respect you for stating your opinion so openly in a forum that are clearly filled with Aliens fanatics (me included).
I've showed the movie to many people and they have had similar opinions to you.
As for the first hour, the whole idea was to present a buildup to the mayhem to come. It's all atmosphere, and in my opinion is something lacking in movies today where they jump right into the action (AVPR for example). Plus this way Cameron was able to give time to character development. By the end of the movie, I felt like i knew almost all the characters so well, so that when something DID happen to them, I actually cared for them (or hated them). AVPR just had pointless killing after killing of characters I had met 3 seconds before their death.
I'm glad you atleast liked Alien or this thread would have probably been deleted a long time ago!!
For me, there is nothing that has come close to the experience I've had watching it and the movie just gets better everytime I see it.
Talk about build up,I don't think anyone was expecting Ripley do face off with the Queen at the end as a grand finale in Aliens.I was totally surprised and what a surprise it was.