It was a very bold step to have a sung theme rather than an orchestral piece, as in the other Treks. HLewis is quite right that it reflects the mood of the 22nd Century era which Enterprise is trying to depict - a time of progress, optimism and looking forward, just as in the old American frontier days. The song is an attempt to give Star Trek a fresher-faced, less stuffy image - it's important that it not become a stagnant genre monster. I don't see why people would disapprove. It took me a while, but by season 2 I was actually thinking of Scott Bakula as Captain Jonathan Archer - instead of Dr. Sam Beckett. Anyone know if he's actually said "Oh Boy!" on Enterprise at all? Given the series' preoccupation with time travel, perhaps there is some still-unrevealed causal link to a secret 20th-Century research program known as Quantum Leap?