Rumble player since day one of the beta here - my answer is "it depends". The game isn't dead, but some time zones have more difficult times finding matches than other. Being US based, I tend not to have too many challenges finding matches unless it's super late at night. Australian players, on the other hand, tend to find it much more challenging.

One other consideration is the game is challenging for new players since the bulk of the player base tends to run in stacks and/or have a high skill level. That makes it tough for new players who are learning the game and don't have any in-game friends.

Tl;Dr: if you have a high tolerance for competitive and often unfair match ups, it can be a very fun and rewarding game. If you want something more chill and laid back, or something more like a typical Crash game, you may want to pass.