You're saying it like you will never be able to use it at all, just because YOU think it’s not fun, it still has use, even if only the player you give it to benefits it is still useful in that respect. Compare it to the equivalent such as dk's dark sim, which was their end level 85 ability! Which is by far arguably useless for 95% of the fights in cata, just like control undead is relatively useless for current content as well. Both have their uses in certain fights/older content; maybe even challenge modes such as scholomance.
However dark sim saw on 2 fights in raid the whole way thru cata, symbiosis even if it’s not used to its greatest potential can still have 100% use, 100% of the time in raids/end game content. You've no idea how awesome that makes this ability; actually being able to use it is a sodding blessing.
Even if the ability gets nerfed for some classes its applied on, it will be done so with good reason, and won’t make you ‘not’ use it. If you’re a guardian druid or any druid at all, you won’t consider NOT using it just because you might not benefit, that would be an absurd notion. The equivalent would be not using a 10% attack power buff if you can bring it, if it didn’t benefit you at all.
Would be moronic wouldn’t you agree?