Lufthansa

Pros: Pleasant crew
Cons: Are they serious about customer feedback? Rude & dismissive Miles and More staff.

My first flight on Lufthansa from Brussels-Frankfurt-Singapore and here's my review:
(1) Seat is uncomfortably hard and not easy to even catch a nap on. 
(2) My pull-out table cannot be deployed and I had to eat while balancing the food on my lap.
(3) This is a long flight and there's no personal entertainment system and it was impossible to watch anything on the small shared TV from my first row without spraining my neck!
4) The fare is equal to or more expensive than other airlines offering superior services e.g. Singapore Airlines, BA, Quantas or SAS.
(5) Lastly, there is no number for you to contact Lufthansa for providing customer feedback. I wonder how serious they value customer feedback. I had to write and fax my feedback to them and it's been a few days. I can only hope to hear from them (I will provide an update here once I hear from them).
The only positive note on my trip is the crew. They were pleasant and nice, comparable to Singapore Airlines.

Pros: NONE
Cons: Terrible, everything

Ignorant, unfriendly, rude and incompetent employees. It took for ever to talk to someone who did not care about my problem. No wonder the germans created the concentration camps because they absolutely do not have any sense of humanity. NEVER aging LF.

Pros: new fleet
Cons: Attitude of personnel.Business class seats.Lounges. 

I fly at least 10 times from Europe to Northern America and back; all in business class. My company uses mainly BA and LH.
In comparison, LH exceeds BA in only one thing - the staff is the most rude personnel I have ever seen in the service industry! As a business class traveler you are treated as a 2nd class citizen.
If I can avoid LH I will do so.

Pros: Food is decent.
Cons: HORRIBLE customer srvice. Be warned: show up to your scheduled flight 4 hours early!!

I agree with the reviewers below. They have a terrible attitude. I showed up to my flight 1:30 prior to departure time and they had sold my ticket!! They would not admit it but they were almost belligerent with me. I could not believe this was happening. I know airlines do that but I had to be on that plane. I'm a doctor and was going on a conference. They were extremely RUDE and told me that I had to come back 3 days later to see if I can get a ticket to Europe. What? Most other airlines route you to a later flight or do something. They were completely and inhumanely careless about their customer. That is not what I am used to with American airlines. Long story short, I will never fly with them again. This is just my story, I'm sure others have had different experiences with them.

Pros: wide network, seldom lose luggage, decent midrange quality.
Cons: Ripping off clients with uncommon fare tricks.

Just had an unsual situation with Lufthansa. They subtly changed fare rules ripping off their clients. It used to be that "none refundable" tickets are at least changable for a later date with a fee and fare difference. Now they require the changes to be done before the original departure date for a new date (with certainty!). If you're not sure of the new date, you ave to change again. The change fee is roughly 20% of the roundtrip fare. Changes after the original travel date are not permitted! When talking to a Representative I found they cannot even send fare rules with email.

I could not go because of visa requirements and lost 1000$ thanks to this trick. So, I put Lufthansa into the "never again" folder.

Pros:  Airlines did not provide them with any kind of accomodation for this.
Cons:     It was very frustrating.

My 2 daughters are traveling alone in India.  They had flight friday morning 9am from New delhi to come to USA.  They went to airport at 6 am on Friday morning and they were told by airlines that their flight was canceled and now they have flight on saturday morning at 2:25 am and now they would be flying to JFK airport instead of Newark on saturday. Airlines did not inform us about cancelation of the flight.  They had 3 numbers given.  They had no apology for this and there was no problem with the weather. They just decided to cancel the flight.  Our family live in Gorakhpur.  My kids took a train to come to New Delhi. Now they are wandering in New Delhi for one more day with their luggage.