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No, it's not almost unusable. First off, if your fighting in a thunderstorm or in rainy/storym conditions(which is bound to happen in the life of a ninja) then the preparation is non existant. In fact he could spam it. Furthermore, current sasuke can spam enton(far more than itachi could in their fight) so the preparation time is reduced drastically.
Indeed, IF there is a thunder storm, then it can be used immediately. However, he STILL can't spam it, since usage of Kirin disposes of thunder clouds (all of the charge stored is used for the technique). So he still could use it only once and would need to prepare it all over again after that. Hardly a technique I'd call versatile.
Oh and btw, how do you know sasuke developed it when he was 16?
Just like we don't assume Kakashi could use Raiden and raiton bunshin in part 1 or Kakashi Gaiden, we don't assume Sasuke could use Kirin before its debut. And he used it for the first (and only) time when he was 16.