Just saw this on the Sci-Fi channel today and I loved it, especially compared to the terrible mini-series, Surface, which ran on NBC last year. Triangle had good acting, good special effects, a tight storyline, a satisfying ending, and was plausible within the basic outlines. I just hated Surface, though I watched most of it -- mostly in the hopes that it would start to get better but it never did. Surface wasted my time -- it was too long and drawn out -- and there were so many loose ends and implausible parts to that story. Its special effects were tacky too, especially that ending scene of the flood. Triangle excelled in all the places Surface fell on its face.
I don't care if the idea of the Bermuda Triangle is plausible or not. If you accept the fact that it exists for the sake of this movie, then the parts of this story make sense -- ie, what caused it and why it was causing so much havoc in the ocean. Sure there are a few things that are unexplained, but they are not major.
To address a few of the comments of other reviews here -- 1) perhaps the reason the 4 didn't meet their other selves in the alternate universes is because the others were also transported to other universes at that same time; at any rate, it's a really minor point ... 2) I read a comment that Lou Diamond Phillips' character could have been left out and it wouldn't have mattered. While it's true his character is non-essential to the basic storyline, it adds richness and texture to the mini-series in emphasizing the impact of the time shifts. Phillips also does a fine job with the role. I guess I'm biased as he's one of my favorite actors.... 3) someone said it didn't make sense that ships prior to the date of the creation of the Bermuda Triangle were experiencing the effects, but if you consider that time shifts are two-way -- that a portal that allows someone to travel back in time will also allow someone in that earlier period to travel to another time -- then it makes perfect sense.
After having recently wasted so many hours of my time on the dismal "Surface," this mini-series is a real winner.