As a researcher, I see they got some things right and some not.
Thank GOD they got the color right. That is a huge pet peeve. Despite it's nickname ("The red planet") Mars is not red, it's butterscotch colored. If you're standing on the surface, it looks like the Arizona desert (sans the cacti, etc.)
YES, observing from Earth in a black sky, there's a slight ruddy tinge. Okay. Fine. It bothered me, however that they insisted on calling it "The red planet" three times in the first 27 minutes of the first episode. As though any person on Earth not living under a rock wasn't already aware of the nickname.
The thing they got wrong, which EVERY movie ALWAYS gets wrong is the gravity. Most movies assume (incorrectly!) you automatically have Earth gravity just because you're in a pressurized environment. So inside crew quarters on the planet, they always show it with normal Earth gravity. Then they go outside in EVA suits, and suddenly they're bouncing around like the Michelin Man suddenly got inflated with helium.
What they did with this series, however is different. Instead of screwing up the gravity problem, they ignored it altogether. They're walking around on Mars exactly like they would be on Earth. And, for the record, Mars gravity is 38% of Earth's not one third, which makes Earth gravity 262% of Mars.
The first two episodes are all that have aired, but from here on out, look for the next big blunder, and that's going to be the force of wind. The atmosphere is 1% as thick as ours, so a 100mph wind on Mars would have the same force as a 1mph wind on Earth(Note however, that the highest recorded wind speeds on mars are in the 60mph range.) This was a major problem with The Martian, and the book it was based on.
For entertainment value, this is great fun and I give it a nine. Just don't try to treat it too realistically and then make assumptions about Mars that aren't true.