A friend of mine said the last few episodes were good, but I can't see how they can turn it around for the better.
Is it worth watching the last episodes?
Not if you're going to base the entire season on it, no! I don't see how the last few episodes are gonna change your mind after making it more than halfway thru the season (6/10) and calling it quits. Although the 9th episode may give you some perspective on what was taking place early on it probably wont matter if you're weren't immersed in the story from the beginning. Personally for me the show really took off from the fourth episode onward. To each their own but I enjoyed the hell out of The Expanse and will be looking forward to the start of season 2 in January.
I think my main problem with the show is there is no likable characters for me.
And maybe that's a good thing?!? Honestly speaking this show ain't no fairy tale for the fainthearted, where you can easily distinguish between the white knight and the evil queen dressed in black. This is suppose to be a story about a series of events, not about good versus evil. Most, if not all, of the characters you see throughout the show are just people, flawed and shaped by their circumstances. I don't know about anyone else here but I enjoy watching flawed and even reprehensible people on TV every now and then. The need to constantly have someone to always root for to me has always been a bit overdrawn and overplayed. It's hard trying to be sympathetic with a bunch of people who can turn an entire planet into a ghastly petri dish, while killing sick women AND children without remorse. Makes you wanna reach through the screen and grab some of these cowards by the neck and squeeze til their eyeballs pop out! Some of the characters can touch a nerve or two if you allow it and based on what we've seen so far this season, there's no perfectly good moral person to root for.
Miller and Holden represent contrasting aspects of human nature to a degree --Miller has tried desperately to hold on to his humanity and has found that difficult since he has to become a killer when necessary whereas Holden still has much of his humanity in tact. As the novels progress this becomes a problem for Holden after his experience with what happens on the space station in the aftermath. The novels aren't black and white either and when characters have to resort to violence, they do but Holden goes on a bit of a journey there and back again in trying to retain who he is given how the things he is exposed to changes him. It will be interesting to see the television series follow the same series of events.