This isn’t a review.

Deadlock isn’t out yet. You can’t even play it without a closed beta invite.
They’re not hard to get, but still.
By the time Deadlock is out, it’s likely that it will have morphed into something completely different from what it currently is.
That said, even in its current state, I’ve already played 80 hours. So I do want to talk about why, and why you might enjoy this game enough to try to play it now.
Why You Might Like Deadlock
Deadlock is Valve’s most current semi-public project. It’s a MOBA/FPS hybrid, taking elements from both genres, and adding a few new elements of its own.
And that’s the first reason to try it. Most of the folks I’ve been playing with are Dota 2 and League players. If you really enjoy those games, and generally like FPS games, Deadlock might be for you.
The other big reason is if you have an appetite for novelty. There hasn’t been a game like this in a long time. Monday Night Combat and Super Monday Night Combat servers went down ages ago, and Deadlock offers a much greater depth from its MOBA elements than those games ever did. There’s also tons of weird interactions to discover, tricks to find, and just general space to play and explore the game’s systems.
This is a game where (at least at my skill level) it’s possible to win a fight with expert positioning and the ability to click heads. It’s equally possible to just have a good enough sense of the map to farm everything out, and show up to the fight with flush with items and wipe everyone out with abilities while being unable to shoot anything.
These are the things that make me love it. But they might not work for you.
…and Why You Might Want to Wait
Deadlock is unfinished. It is probably not quite balanced yet. And it can be kind of buggy. And has a bit of a learning curve.
Most of these (outside of the bugs) are positives for me. But if you’re the sort of person who gets really annoyed when someone on the enemy team shows up and kills you in two seconds, you may have a bad time. If you’re the sort of person who gets annoyed when a creep wave bugs, and doesn’t push properly, you are going to suffer.
And there is a big learning curve. Just like Dota, this game has dozens of items to learn, many of which have activated abilities. It also has one of the densest maps I’ve seen in a MOBA, and even after the 80 hours I’ve played, I only have a general sense of where everything is.
Also, the art, while quite good, is not up to the Valve standard just yet.
Overall, Though
Deadlock is likely to be my most played new game of the year. It’s entirely possible it actually replaces Dota 2 as my “lifestyle” game, a slot that Dota 2 has occupied for almost 10 years.
There’s no reason to rush to play Deadlock just yet. It’s likely that it will be a much more complete game by the time it reaches a full release. But while there isn’t any reason to rush in, I really cannot overstate just how fun I’ve found Deadlock to be.