I like it. I'm glad I'm not one to get caught up in how realistic a show is, or if the historical context from 85 million years ago is correct (like anyone really knows, anyway). I thought the effects were good for a TV series. I like how the story likes are starting to take shape... there are obviously two factions, which are not fully explained yet. The leader of the colony & the leader of the Sixers seem to have some history together. There is the lost son story line, the drawings on the rocks by the river, how to deal with dinosaurs, etc. I'm looking forward to seeing how those pan out.
As to the astroid arguement... this is a quote taken from an interview with one of the show's actors:
"The other thing is that people are also very quick to dismiss the timeline aspects of it, saying that the Butterfly Effect would mean that none of this is possible. Or, “There’s an asteroid coming in 20 million years, how are you planning to deal with that?” “Why would you colonize the past? That’s a stupid idea.” There are these people who have contempt prior to seeing it, and it’s like, “Relax, guys. The people writing this show are really smart and they’ve considered all of this stuff. Just sit back and enjoy the show.”"
I'll keep watching... looks like an entertaining series to me.