I don't read the comics, so I'm assessing this as a pure TV show.
I have no problem at all with the cliffhanger. Sure its a tease, but some of the best shows do this all the time (Game of Thrones, Lost, Breaking Bad, etc.). Heck SW E7 ended with a bit of a cliffhanger about what happens next with Rey and Luke, and we still have no real idea of Rey's heritage. If you don't like cliffhangers you probably shouldn't be watching TV, or movies, or reading books that are part of a series. Either that or load up on Xanax for season finales.
Like I said, I have no idea what the story line is in the comics and where it is "supposed to go" from here, but I mostly really liked the last episode. I agree all the roadblocks seemed like way too much trouble to go to even if they did have thirty scouts with walkie talkies, or a drone, or whatever. But I just chalk it up to creative license to build the tension and show Negan's power.
I am looking forward to next season and how Rick and the crew decide to handle Negan's power, how they may try and build an alliance with others, etc. I'm guessing they're not just going to play nice and hand over 50% of everything for too long. **edit - I just read a snippet about how the comic series plays out and it sounds like some solid material for next season.**
And I ended up liking the Carol/Morgan story line as well. They found some new friends and it might give Carol a shot at some moral redemption by seeing how a different "society" has managed to survive and deal with the moral challenges of a Negan/zombie world.
I felt this season was fairly solid overall. Its gonna be a long summer...