While the FFG Star Wars system isn't all that worried about character balance, the Sullustans in AoR seem somewhat underpowered compared to other options. Most of the nonhuman species have a 3 and a 1 in their stats, a bonus rank to one skill (or choice of two), and a free talent or other special ability.
Sullustans have the stats and skill rank (though I could argue that Astrogation is a rather weak skill from a story standpoint), but lack any bonus ability. I don't know how much it fits into the existing lore, but based on D20 and SWSE, I'd expect them to have some kind of dark-vision ability. Possibly give them the same benefits as Scanner Goggles, for free.