I saw the new Alien movie last night and was very disappointed.
I loved Prometheus and if you watch the original Alien immediately afterwards, it all flows smoothly and logically.
I'll be penning a full review for the local free-paper I write for later this week, but this is what I said on Facebook after someone asked me for a quick, spoiler-free summary last night :
I'll save a full review for the next edition of The And Guide but I will say it all felt a bit unnecessary. There was a nugget of a good story there in terms of how the alien evolved but it just wasn't that well executed. It didn't feel like an Alien canon movie till about an hour in, then it picked up for the second half but the ending was signposted way before it came.
Disappointing compared to Prometheus. Still a must-see for fans. Maybe it'll be better a second time ?

