Yea, it's an interesting gaming experience. If we compare the 1 crate shopper and wxw schemes to the regular ones, we discover some new gameplay nuances:
1. Players plays with a slight lack of weapons, because if someone failed, the next player won't receive an extra crate. So everyone needs better planning their attacks, and use zooka more often.
2. There are no situations when one player gets an "easy to pick up" crate and another player gets a "hard" one. If one player failed to take the crate, the next player should take (or destroy) the same crate, no matter where it's spawned.
3. If someone is afk or cowed (this happens often in fun games), the next player won't receive an extra crate, so no more "cheap" advantage over others.
4. There are no situations when players intentionally blows up a crate for extra damage to their opponent's worms. To compensate, I've added a green barrels into the scheme.
In general, everytime I host, I prefer to set up this 1 crate scheme over the regular one.