Regarding Carol & Daryl... Sorry, posting from iPhone so quoting is tricky when the post is more than a few lines...
I don't know how old either character is supposed to be. Daryl doesn't exist in the comics and Carol was 24, which she obviously is not in the show. Norman Reedus is 47, though, and Melissa McBride is 50. I assume Carol is supposed to be younger than that since her daughter looked to be about 10. So it does bug me when fans complain that she's "too old" for Daryl. I'm not sure why Daryl seems to come off as a young character. I always thought of him as at least 40.
I assumed there was something going on between them off screen in the prison, but they don't have the same chemistry since the group was separated following the battle with the Governer.
The Daryl and Beth crowd bugged the shit out of me. I'm so incredibly glad that didn't happen. She was 17 FFS, and as stated, he comes off as at least 40 to me.
As far as attacking the Saviors on short notice... Part of it would be time-sensitive due to their plan with bringing him the head. They can't wait long if that's going to work. I'm guessing maybe they're so used to being alone and finding little rag-tag groups that they wrongly assume this one is also small and ill equipped?
Definitely ok with the attack on the Saviors. It's a them or is situation. Best to play it safe, even if it means fighting dirty.