I have flown Singapore Airlines from the past 20 years regularly from SFO to India--until now, I considered myself to be a loyal customer. They used to care about customers before-- apparently, being named the best airline in the world has gone to their head, and they don't have to care anymore .
I flew Premium economy recently to Bangalore (350-900) --the flight was ordinary. I had paid extra for extra legroom seat in Premium economy. I was expecting an offer to upgrade to business class before my flight (like Emirates, or even China airlines, offers a couple of days before). I have more than 50,000 pts that I have painstakingly collected and transferred from my credit cards. No offer came--I tried to offer a bid, the system didn't allow me to. When I saw the flight, there were plenty of seats empty in Business class. Not sure why they don't want to offer the premium economy passengers to upgrade to business.

Warning to everyone traveling from SFO--some connections to India have a very short layover--less than an hour. SA doesn't have any consideration that if the landing is a few minutes late and the connecting flight is within 30 minutes, they shouldn't make the passenger run from one terminal to another even using Skytrain. I barely made it before the gate closed (with my bad knees). Remember, you have to go through security in Singapore when you have a connecting flight. I had to rush from Terminal B to C.

While returning from Bangalore, I had ~4 kgs extra. Instead of asking me to pay using my over 50000 points, Singapore airlines charge me for a whole piece. So watch out, even if you are just 3- 4 kgs over the limit, they will charge the cost of a whole suitcase. This is another example of not caring for customers. They can charge per Kg weight instead of an additional piece of luggage like other airlines do--no, they are special because they go the tag of 'World's best airlines' . Not allowing me to pay extra baggage with my points, no consideration if you are Kris flyer member with 1000s of points, they just don't care about you but want to make you pay for everything.

Flight and food was ordinary (food quality has declined from SF to Singapore) and the bathroom cleanliness while going and coming was not up to par like it used to be.
Changi airport is exceptional of course. I am not sure I will be flying this airline again while there are so many carriers who offer upgrades for reasonable price, cheaper tickets. Not sure what to do with more than 50,000 points though.