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People saying it doesn't work, what are you trying to do? Are you trying to use 2 fusion substitutes? Are you trying to summon something that says it can only be Fusion Summoned with the above Fusion Material Monsters (Ryu Senshi for instance) with this card? Are you trying to fuse with the Spell card "Fusion Substitute" using monster(s) from your hand?
None of those actions are possible, and that's no bug.
This is a good card especially because it can be used as a fusion material to save a card from being polymerized and be used later. It can also speed up the time it may take to draw the fusion materials and polymerization/fusion gate because it's an alternative to draw instead of the 2/3 fusion materials.