I'll give you the rundown since I was in a similar situation to you a few months back.
Don't.
It's a neat game and one of the few where you can actually fly around in a city with decent freedom, not just gliding (the movement was what sold it to me) and it does look pretty considering it's age.
It also has an interesting concept for builds where you can have 2 specs to switch inbetween at anytime (with a cooldown) and everyone has a "damage spec" for when you're solo or you need extra damage and an "utility spec" where you do something other than damage. Even doing something like a Rogue or Healer, you can actually do more than your standard generic role.
However, it's repetitive. The missions vary considerably in story, if you like to read on it and be immersed, but otherwise they play out very similarly and are never a real chalenge. Most of the content happens in raids you can join and play as an original hero or in other types of raids where you do play your guy. Most of the time you'll be queing for those while doing overworld stuff.
The map is huge, divided into several sections but there's nothing really that appealing to explore, you'll just move to complete your quests and level-up faster.
There's a shitload of stuff locked behind a paywall, even very basic stuff. Your money amount is very limited and some of the rewards aren't given to you unless you spend at least 10$ on their stuff, which increases the limit, or you buy a subscription which actually removes it.
Creating guilds is also limited to those who pay the subscriptions and joining them requires that you at least pay those 10$.
The PvP is also fairly redundant and autistic. You can go around the world but you'll rarely meet someone at your level. More often instead you'll be doing a quest in a zone and someone 324353 levels above you will arive and fuck your shit up, especially if you killed him or a friend before in the same place, even if it was a fight between equal level characters (this happened to me)
Meanwhile, everyone also queues for PvP in arenas where you'll get your ass kicked by people that have been playing for longer than you and thus know the game better have better PvP gear that you can grind by playing PvP.
The worse thing about the game is the company itself that made it and how they constantly try to get money out of your wallet. They are a business and that's expected, but it gets severely annoying at how many times they remind you that "You can buy this thing and it's super sweet!"
It happens with Planetside 2 as well, another game by them.
Go play any of their games and you'll see that at any point in time, regardless of where you are or what menu you have open, there's a button somewhere reminding you about something that you can spend real money on.
TL;DR
It's fun, but it will wear off fast and you'll regret every penny you drop in it.