Then why did you preorder in the first place? Makes no sense.
I'm going to be nice and lay it down so you can understand it.
"I was never so hyped as everyone else"
There's a lot of people who IMO are overhyped. Until now we hadn't seen enough of the actual game to be that hyped. Does that mean I didn't find the concept interesting and that I didn't think the game was going to be good? Nope.
"but it looks more generic than I expected"
I don't know how I can dumb it down. When I preordered it, I didn't know how the "moment to moment" gameplay was going to be, now I see that it's more of the same.
"I'm not in the mood for another FC Primal, robot dinosaurs or not."
So robot dinosaurs are very cool, and killing them looks to be more interesting than killing animals in Primal, but it looks too similar and I failed the three times I tried to play Primal. It's not interesting.
In conclusion, I preordered it based on an interesting concept, a good developer, the fact that it's one of the top games of 2017. Now that I have seen more of it, I realized I prefer to cancel the preorder and wait, my fear of missing out has been eliminated.
Makes sense now? Please don't confuse agreement or approval with coherence. It's perfectly fine if you disagree or disapprove.