The Xindi War may not have been what ENT was supposed to be about, but I found seasons 3-4 ultimately more enjoyable than 1-2. YMMV of course.
Agreed that ENT ending with "Zero Hour" as the final episode would have been disappointing no matter how one sliced it...though if it had ended with Earth's allies (Vulcans, Andorians, etc) arriving with a fleet to stop Earth from being destroyed, that might have been compelling.
Agreed that ENT ending with "Zero Hour" as the final episode would have been disappointing no matter how one sliced it...though if it had ended with Earth's allies (Vulcans, Andorians, etc) arriving with a fleet to stop Earth from being destroyed, that might have been compelling.