Overall, I thought it was a good series/season (more would be nice). However, I sometimes felt the episodes to be a bit disjointed and covered too many topics that should have been better organized throughout the episodes. Some episodes were right on point, but others lacked a sort of structure and flow to them and, in my opinion, tended to soften some otherwise extremely interesting teachings. Perhaps some may have found the show and the topics presented to be too hard to follow at times because of this, but I'm not sure.
I also wish the show was a touch more technical in combination with the above. I don't think some of the topics were covered extensively enough to really have that "wow" factor behind them or make total sense, as if it were almost too simplified. Occasionally it would trend the opposite of this as well. And, while I can appreciate some of the jabs made at the religious or anti-science folk, I also thought the show was often a bit too aggressive in this regard. It detracted from the educational and inspiring elements. I also don't think this is the best way to deal with folks if you're trying to convince them of your viewpoint. That said, I'd much prefer a more aggressive approach (often deserved) than too soft of an approach, especially regarding topics that involve the well-being of all life on Earth (i.e. climate change and potential impact over hundreds of years).