TV shows are renewed season by season unless insanely popular. Enterprise was a Star Trek prequel on a network with low viewership. People were watching cable by 2001, not local TV. A lot of people didn't even know the show existed. The producers, writers, cast; everyone gave it their best shot. The show lasted 4 seasons, 98 episodes. Compared to sci-fi shows in general, is this really a bad run? I've found it rare for sci-fi shows to last beyind 5 seasons. For that reason, I call Enterprise's 4 years a good run.