Enterprise was pretty much on life support during the last two seasons. The writing might have improved later on but people had stopped caring by that point because the first two seasons were so medicore.
A new Trek series ABSOLUTELY can't ride on the cocktails of the Trek name and expect to get seven seasons anymore.
TNG was the only one that I excuse for starting out weakly. DS9, VOY and ENT should have been great from the start. The slow start hurt every spinoff after TNG.