The ending seems to suggest that Cloud is going to change the timeline (possibly saving Aerith), leading to a "Kelvin-verse" scenario similar to
Star Trek. It also lacks much of mystery which tied Midgar into the broader "Reunion" arc. To say nothing of the stupid love triangles and fanservice.
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Characters don't behave anything like their PS1 counterparts, even before Cloud has his premonition. Like Coster said, Cloud went from a multifaceted character to someone who mopes all the time, forever hunting Sephiroth and trying to avenge Aerith. Nomura probably wishes that Vincent Valentine was helming this series. So, he's busying himself trying to angle Cloud into this Vincent-shaped hole.
Go skim the Let's Play Archives. Have a laugh at the screenshots. Get the gist of the plot. Or just play the original on PC.