If you guys genuinely believe that the level of service I've described previously is perfectly acceptable, then I guess no amount of customer input will change the way you think.
So you are still not happy?
You have asked "Do you know how this can happen?" We have explained why it can happen to you. I'll summarise for you:-
1) The sequence was not stable or has changed rapidly.
2) The controller was too busy.
If this doesn't convince you then I'll give it one last shot but then I give up.
"Safety, Comfort, Schedule". I believe most airlines have something along these lines. Schedule is the lower priority. Translate this to ATC, sequencing is the lower priority.
I invite you to tell us how the system can be improved considering all the factors raised in the previous posts. I am genuinely interested because it is something that we have all pondered for many years.