Agreed
A sample of ours from the UK:
Dear xxx,
Further to your recent interview for the above position with , I regret to inform you that we will not be proceeding further with your application on this occasion.
The calibre of all applicants was extremely high, particularly those who were shortlisted for interview, and we were faced with some very difficult decisions.
We would like to take this opportunity to thank you for your interest in and to wish you every success in the future.
Yours sincerely
xxx
Short, to the point, and polite.