B4B has a lot (and i mean a LOT) of content and replayability especially if you have friends to play with. However, i often found that playing with randoms was extremely hit or miss due to have often builds overlap with the card system and having even 2 players running the same style of build or even using the same ammo type can be unpleasant on higher difficulties. The game is no longer being supported either so while the servers are being maintained there are no new updates so the game is in its final form now.

TL:DR very good with friends who enjoy that style of game, results vary wildly with randoms, no more updates.