By now, Syfy has managed to garner a lot of very positive buzz from reviewers for The Expanse. I don't begrudge them that. I think making the first episode as widely available as they have - not just on their website, but for free on-demand viewing across cable providers, etc. - is both clever marketing and a nice gesture to potential fans.
But to be clear: The pro reviewers have seen (I believe) the entire first season of the show. I'm not one of them. My opinions so far have been based entirely on the only episode I've been able to see - Episode One. As the show progresses the opinion may change, mutate, become more refined, or stay completely the same.
We shall see.