The first Wario Ware is pretty addictive, and one of the best toilet games ever.
Wario Twisted is okay, but more of a novelty due to twisting the GBA to manipulate levels.
Wario Touched I played through once and then never touched it again, but I hate the gimmicky stylus stuff.
Never played the Wii or GC ones, so I can't comment on those. I'd say go with the first Wario Ware, since it's surefire fun.
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