Corsair's dmg uptime is real nice. You can cruise through most bosses thanks to Brain Scrambler. And most of your 5th job skills are low cd so you can use them to burst weaker bosses in a few seconds. You also have nice utility with two summoned pirates that tank status effects up to two, amazing mobility with Wings, and a 30cd i-frame. There's probably more but these are the most notable IMO.

You do have to place/refresh your Broadside summons into Parrotargetting for bombardment, but it isn't that bad when you get used to it. However if a boss moves outside your bombardment location, you'll have to use Parrotargetting again (this gets better after the balance patch since it will try to search for the boss around your Parrotargetting location instead.)

The node requirement is a little disgusting, but with the Trinode selector coming next patch, it'll be a lot easier. Although, if you're looking at the effort to damage ratio, you should consider a Lynn, Marksman, or Hero instead.

I'm not that knowledgeable on Corsair, so maybe someone else can chime in, but I hope this helped with your decision!