Crucible prototypes are not worth the effort.
If there is to be a crucible prototype at all, it should be limited to primaries and only one of five prototypes.
Plenty of people simply ignore their crucible prototypes altogether, electing to waiting for more PvE prototypes on reset. Bungie can see this in their data.
Point is, they're not fun... they're a chore. Something needs to change.
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They're "free samples" of the various archetypes offered by the different weapon manufacturers (Hakke, SUROS, Omolon). If you liked the free sample, it might make you consider looking for their stronger versions. The Legendary version you're garanteed to find from Armsday orders will turn out to be very similar to their common counterpart (if you were fine with the reload speed of a common rocket, it can only get better from there).