As a preface to this review I would like to first acknowledge (briefly, as necessary) the positive qualities of Blacklight: Retribution. Mechanically, the game is fantastic. The guns feel really good, the maps are extremely well-designed, customization is just flat-out awesome, and overall the gameplay is great and very well balanced with few exceptions. Most importantly, it's actually a lot of fun to play (and it's really not "pay-to-win," you just need to practice more, I promise).
However, as somebody who has suffered more than 100 hours of constant (CONSTANT) problems with this game over the years, I would honestly not recommend that new players waste their time. Here is a laundry list of problems I deal with, literally, on a weekly basis: CTDs, memory leaks, problems connecting to the Perfect World severs, dropped connections from games, game launcher not launching or won't connect, horrendous performance drops after map changes, horrendous performance drops in general, graphical glitches galore, extreme lag and hitbox issues, and the fact that Steam achievements just don't work (they never have).
This all sounds really bad, of course, like a brand new game that was just rushed out of beta and still has some kinks to work out. If that was actually the case, some of these problems might be forgivable in the short run; however, all of these problems are actually KNOWN ISSUES, and they've been known about for more than A YEAR. I don't know if the developer just doesn't know how to fix them or if they just don't care, but as many people in the community will tell you, nothing has been done about it. On the plus side, at least there's all this shiny new gear in the depot waiting for your wallets! Yuck.
If all this sounds unreasonably harsh for a game that is, after all, completely free, well... I'm one of the saps that actually paid for it. Initially I bought the Starter Pack ($15) and later spent $20 on Zen so I could make my digi-agent as digi-cool as possible. I decided it was worth it to invest in this game because, "Hey, this is actually a really good game that's a lot of fun, and maybe my investment will help keep it alive and growing!" Unfortunately, it turns out that what they spent my money on was coming up with new ways to ask me for my money, rather than patching up the game and making it actually work. So essentially, I've spent $35 on a broken and unfinished product so that everyone else could keep playing it. You're welcome.
On a related note, I think it's funny and perhaps a bit telling that the best custom weapon tag you can get in the game is actually a promotional item for the dev's upcoming title, Daylight. Whatever significance that holds for you, the likelihood is that, at this point in Blacklight's life cycle, this is probably as good as it's going to get. They also have the PS4 version to make money off of now.
I won't even mention the fact that the community is so rife with cheaters that the company actually endorses a third-party cheater "blacklist" website as a resource for server admins. Oops, too late.
Actually, the community as a whole is pretty terrible. There seems to be no shortage of players whose primary goal is to be as annoying as possible, and the player base is apparently mostly comprised of mouthy "hardcore" gamer kids circa Call of Duty age. People's behavior is generally completely intolerable, and this is coming from a guy who played Counter-Strike in 1999.
As I said before, Blacklight IS a really good game. Hell, I'd even say it's one of the best multiplayer FPS's of the last few years. I would encourage anybody to at least download it and see what it does for you. Just be warned, however, that your mileage can and will vary, and I would definitely NOT recommend sending even one dime to these people. It isn't worth it, or at least it wasn't to me. It's a great game, but it's a lousy product. So play it for free if you want - use it, abuse it, grief it, twist it, bop it - nobody is listening or seems to care anyway. Have fun, but keep your money to yourself.
To be fair, I know not everybody has experienced the problems I have. That doesn't mean they don't exist, and if you read forums around the web you'll find many, many other people who've seen them too. That said, based on my personal experience, I would not recommend this game.