There's nothing wrong with snails. Sure they eat plants and multiple quickly, but they can be kept under control with little hassle.
I don't know if you have them, but some fish (loaches in particular) will certainly love you for adding snails... and will keep the population well under control.
The old lettuce collection technique also works wonders if you've got too many.
They do add life in small doses. Just don't let them take over the tank.