Yeah, there will be spoilers ...
I mentioned in an earlier post that I liked this one. I should probably clarify further to "I didn't hate it as much as some people seem to online" but I do agree with much of the criticism. Then single most applicable word I can apply here is "unnecessary" as in no one was really asking for this movie to be made.
The original 1999 Matrix movie is great, was incredibly impactful in its time, still holds up today, and is a great, self-contained story. If someone was only going to watch one this would be the one.
The first two sequels, Reloaded and Revolutions, are good movies in a lot of ways and they do expand the universe and we do see much more of the story of freeing humanity from the machines but most opinions feel I have read feel like they do not quite achieve the same level of greatness as the original. I'm in this camp as there are a ton of cool moments in them but I sometimes feel like we see too much ... by telling the rest of the story it limits what one might envision as "the rest of the story". I don't think they're bad but I think you can stop with the original and not be missing a lot of crucial information.