I have watched all eight, here are my full thoughts with spoilers, don't read, etc.
GOOD THINGS
+ Maeby is the best character now and Alia Shawkat is doing her best work since the start of the show (she was like fourteen when it started though, so that's probably to be expected!) She's the character who goes through actual character growth and her performance enhanced the material. Her story in the old folk's home with Stan Sitwell really worked because it was funny but also quite sweet and had pathos. If they made her the main character with the other (less available) actors as support I'd literally be happy!
+ Buster is pretty funny in all his appearances (though I think Tony Hale must have been busy with Veep because he disappears for a while.) The stuff about her Terminator hand was good.
+ I liked the weird fight scene between Michael and GM at the end of episode three.
+ The Ron Howard stuff was better than in season four (I hated it then.)
+ After a slow start things do get quite good for episodes six and seven. They're not original series quality or anything but if the whole season had been that good I would have felt "yeah, that was good!"
+ There's still some clever stuff in there like the "island for rapists and murderers" bit and some clever wordplay.
+ The GOB/Tony Wonder stuff is kind of sweet, when we actually get some.
BAD THINGS
- Portia de Rossi has retired from acting and only appeared briefly as a favour. And she obviously filmed her stuff seperately from the rest of the cast. It's hugely disappointing, her absence is felt greatly and the marketing made it look like the whole season would be about her senate run which was very misleading!
- Some scenes are so slow. I watched the first three seasons recently and it's so fast paced with funny lines coming so fast that you miss some because your'e still laughing at the last one. They never really achieved that here.
- They don't have a clue what to do with Tobias anymore and they managed to make possibly the funniest character from the oirignal seasons pretty unfunny! The stuff with him impersonating the family wasn't good and his weird bastard son wasn't funny.
- I really liked GOB's story in season four so it's a shame he's just treading water for like the first five episodes here (and Will Arnett looks rough.) Like I said in "good things" they do eventually get Ben Stiller to make an appearance (which seems like it was probably filmed seperately from Arnett, now that I think about it) but it's not enough.
- Michael Cera looks weird as an adult.
- Episode eight wasn't funny at all and was a bad place to end the season.
- There's no real over-arching story to the half season. I have no idea what's going on with Lucille 2 and I don't really care to find out.
- A lot of jokes miss.
- The timeline is more confusing than Twin Peaks. What year is this?
- Some of the callback jokes feel really strained.
I don't know, man, maybe the next eight will be better. Like I said it did get good in episodes 6 and 7 (and probably like 4 and 5 were decent too), but then got bad again in 8. Who knows! I definitely laughed at least once at each episode and there were some good parts (really the whole Maeby story was great.) So I'm not saying it's shit now or anything. But no it's not a return to form either.
ANYWAY WHAT DID EVERYONE ELSE THINK LOL.