So was the Delta flight unacceptable? Anyone asking that that flight be investigated? Or is that what a takeoff at runway limited weight looks like? It can be uncomfortable looking out the front window at V1 at the remaining runway and we're often left thinking "well officially this was supposed to work."
But without knowing the performance facts for the flight using that camera angle instead doesn't show proof of harm. I've seen enough weight limited departures to not be astounded at the video.
And check out the difference between rotation rate, and initial pitch attitude, in the Delta MD-88 and the 737-800 videos. Anyone who's flown both models knows why the reason for the difference.