The Gang is a cooperative game for 3 to 6 players, who try to pull off three successful bank heists before tripping three alarms. The mechanism for this is poker. The group plays a standard hand of Texas Hold 'Em, but at each moment where there would normally be a betting round, each player instead selects a chip with a number on it. This is the only way to pass information to the other players, who otherwise cannot discuss the contents or quality of their hands. After the final round of "betting" (chip taking), the players reveal their hands in order. The player who took the lowest-valued chip in that final round must have the worst hand, and so on up to the player who took the highest-valued chip, who must have the best hand. You succeed or fail completely as a group, playing a "best of five hands" format to win or lose the game.
Board gamers -- especially the ones trying to maintain a smaller, curated game collection -- will often talk about whether one game "kills" another, offering the same thrills and more in a new package that displaces some earlier release. I don't think that The Gang is a "Crew killer." But I think it does show that there's room for more games following in The Crew's footsteps.
For one thing, a lot more people are familiar with poker than, say, Hearts, or Bridge, or any of the trick-taking games commonly played with a standard deck of cards. If you're looking for a game that's easy to teach, and accommodates players with a wide range of gaming experience, The Gang feels like the far more approachable option to me over The Crew.
As a practical matter, the fact that The Gang takes up to six players is notable. The Crew caps out at five (and, realistically, is far better with four). Not only can The Gang take more, it's actually better (or at least, more of a challenge) the more players you have. And thanks to the simultaneous, cooperative play and people's likely familiarity with Texas Hold 'Em, it's still a fast game with six.
That said, if you're bound and determined to have only one game in your collection -- this, or a version of The Crew -- I'd say you're unlikely to choose The Gang. First, there's not as much variety here as there is in The Crew. The different goals you pursue in The Crew (especially in the Mission Deep Sea version) can make different hands feel wildly different in strategy. The Gang has less variety; you're always trying to rank the strength of your poker hand. Sure, the nature of Texas Hold' Em itself can make that trickier some times more than others, but you're always thinking about the same basic possibilities.
The specific thing you wind up doing in The Gang can feel quite similar too. When another player takes the lowest chip, and you're convinced you have a worse hand than they do, you're allowed to take the chip from them for yourself. They're allowed to take it back. You can "debate" through the passing of chips as much as you want -- so long as you don't actually say anything about the cards in your hand. And since you can't actually make any persuasive arguments -- as you could in, say, other cooperative games like Pandemic where players find disagreement -- you kind of just wind up having one player eventually say, "okaaaaaay" in a tone that clearly says they don't think it's okay.
In other words, the gameplay of The Gang can get a little repetitive over time. I think in recognition of this -- or at least to inject more variety generally into the system, the game includes a series of "temporary rules" cards you can optionally use. Whenever you fail at a hand, you reveal a condition for the next hand that helps out. Conversely, when you succeed at a hand, you reveal one that makes the next hand more challenging.
Regardless of whether you use those optional conditions or not, the game generally stays interesting throughout its quick play time -- especially if you're playing with a new player or even a new mix of experienced players. Each person has their own estimation of the strength of their own poker hand, which simply might not match how any other player might estimate the same hand. One player might use "betting" along the way to try to indicate potential (a "drawing hand," in poker parlance), while another player might always be trying to state simply how good the hand they have right now is. These quirks of communication make The Gang a different experience for each group that might play it.
I give The Gang a B+. There's a chance that playing it might just make you want to play Texas Hold 'Em or The Crew instead. But taken on its own terms, it's a fast-paced, fun enough experience.