There are many negative reviews of CW and F on this site. But although I have not yet flown F (hopefully later this year

) I have never had a bad flight in CW.
For me it all comes down to the seat. And I do aspire to the F seat because it seems a lot more roomy than the CW equivalent, at least on the 777 which now operates on DOH<>LHR.
Due to the wide difference between my own entirely positive CW experiences and the bile that comes out on this site from time to time I mainly ascribe the complaints to unrealistic expectations. At the end of the day it is a seat in a tube. Albeit a very large one.
The only thing that I would truly describe as unacceptable is if the seat is broken.