4
In hindsight, "the Xindi attack" was a phase change into a much more hard-boiled season of Enterprise.
(startrek.website)
They cranked it up way past 10, all the way to 24.
To me at least, it is 3 difference concepts taking turns driving a single program. S1-2 feel like the TNG formula, but with the twist of a primitive crew and ship. S3 feels like a mutiny of star trek itself. S4 feels like they sort of forgot they were supposed to backfill the canon.
That being said, I've walked away with it among my favorite treks. I personally rank Degra right up there with Dukat and Kai Wynn as some of the most distinct and well-developed trek villains.
Find "shields".
Replace with "hull plating.
Boom. Script's done!