Perhaps I've just become desensitized to the whole flying experience, but I've been on flights with worse events than those described above and not complained. Heck, even on other carriers (yes, even LH and CO).

One thing you may want to consider is that they somehow link any complaint to your DM#. So do you want to be known as a complainer in their system?
I'd rather save for when there really is a major issue (ie an involuntary bump leaving me stranded overnight, no hotels available, no cars, etc).