I've had cause to post about poor standards on KLM and SAS in the recent past.
I've flown BA many times, domestically and internationally. I must say that, invariably, CC and service were good to excellent, even during rushed Shuttle flights. Ground-based staff let themselves down once during a delayed departure to Philadelphia (no info) but I feel BA is one of the better airlines. Flights with Qantas have also been very good in my experience.
I've had poor service on SAS, KLM, EK, American, Air Canada and RBA, to name a few; it's the luck of the draw!