I honestly don't know much about this game and i'm not big on shooters, but i'm really intrigued by this game. If there is just one thing I should know, what would it be?
We'd need to know more about your interests and game preferences to give you a single answer.
Like tactics? How about a game that rewards teamwork over all else, so a well-led squad will not only win, but level up faster?
Into stealth play? Why not try Operative class? If you're into slower-paced sneaky tactics, go Heavy and you get the added advantage of big guns, if you're better with fast-moving stealth, then Light will be your favourite.
After something more intelligent than your average shooter? No "TDM tedium" here (joke stolen, but reworded). Multi-objeective mission-based play, in both single- and multiplayer.
After it because of the Parkour references? Look no further than the SMART system. Easy-mode free movement for players to get a bit of an edge over other shooters, but skill players can push the limits of the system and pull off more impressive and insane tricks.