I'd say it depends on your definition of 'good'.
Especially on league lanes, a good consistent hook will usually allow for a larger margin of error. Not so true when you move onto the sport patterns. Even there though a hook will usually improve the path through the pins ensuring more strikes (I bet somebody has a link bookmarked somewhere to show the various paths and deflections with and without hook).
You can get a fairly respectable average with a straight ball, out scoring many hook bowlers if you have the accuracy. If you can hook though it'll give you the opportunity to get just that little bit higher...if you get it right.
But then again, unless you're planning on entering scratch tournaments I'm all for bowling in whatever style you enjoy. I think too many recreational bowlers stop enjoying the game so much because they feel the need to look like and score like their favorite PBA star and for most it's never gonna happen.
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