Slow Vs fast rotation rates.
I agree with the 3 degree rotation rate. If you are not going to do 3 degrees per second then slower is better than faster. I have often shown my Co-pilots how close some A/C tails come to touching the runway on take-off by making them observe actual take-offs at various runways while on duty. A slow rotation rate also gives the A/C time to get to correct flying speed if the take-off speeds have not been correctly worked out (within reason).