Yeah, the plan to capture a wight and show it to Cersei is just too ridiculous. King's Landing is more vulnerable than ever: the Dothraki and dragons should really just take it. Daeny has no reason to stall for time, even if the Night King is an immediate threat. It would take far less time to BBQ Cersei and take the throne, and then they don't need to worry about going all the way north, finding a wight, bringing it back, and asking for a temporary truce.
And I second the complaint that we are blowing through waaay too many interesting character combos. What would Gendry have to say about Daenerys? What about Varys and Ser Jorah, his one-time spy? I'd gladly take a couple more scenes between Ser Davos and Tyrion (or Ser Davos and anyone, really). And none of the characters who used to call Dragonstone a home really got much space to reckon with the things that had happened to them there (Melisandre, Ser Davos, Gendry).
The stuff happening in Winterfell is potentially quite interesting, but it's not getting fleshed out very well, which is because we haven't spent enough time seeing the characters interact with each other.
Also, it still feels weird to have no one of any importance in King's Landing, other than Cersei and Jamie and I guess Qyburn. This would be defensible if the other storylines were getting more time in return, but somehow I feel like Sam mostly came out ahead, and Sam's story is just not that interesting, even though I quite like Sam. (Gilly casually discovering that Jon Snow isn't actually a bastard--and being promptly ignored--was actually quite amazing.)
The wight-hunting team is also pretty ridiculous, such a random assortment of characters. I feel pretty under-invested in Thoros and Beric, so I assume they aren't going to make it. Ser Jorah might be in danger, too... there can't be very much left in his arc.
Finally, the teleportation problem is insanely glaring, although I respect the show for being so committed to ignoring it.
Anyway, that's a lot of complaints, but I'm quite liking the season!