I don't play a hunter anymore, but based on a quick glance at the
hunter specific addon category it doesn't look like there are many actively maintained hunter addons, and none of the ones updated in the last year (there are less than 10!) appear to be very useful. Most of what I see in there appear designed for people who are too lazy to put traps/MD/etc on their action buttons themselves (or bind a key, or use
OPie) and/or are too unobservant to notice when they're dazing the whole raid with AotP. I don't see anything critical, or anything that isn't better done with a more general purpose addon (especially if you play more than one class -- for example, if you want multi-target debuff timers, get one that works for all classes, like Raven or ForteXorcist, instead of getting and setting up and learning how to use a different addon for each class).
As with any type of addon, I would always suggest you start out with
no addons, and then when some part of the UI starts annoying you, or you start wishing you could see some info in a different way, or you start wishing you could do something differently or customize something more, go find an addon to fix it. Blizzard does a great job of making the default UI very usable, and of adding their own implementations of popular addons (scrolling combat text, compact raid frames, boss ability warnings, etc.).