relax. there is an easy way to determine your other storage. first of all, the other storage contains Map Data, SMS, Email, pictures and app install packages, keyboard suggestions,
tell me language packs etc..
You need to ask yourself those questions:
How much MapData do I have installed?
Depends on what Maps you downloaded 45Mb-5 Gb is possible.
Have I Integrated Facebook?
This Is something many People tend to forget, all those Facebook picture albums are beeing saved onto the phone! (500 Mb, ~130+ pictures on my phone)
Skydrive sync?
Srsly I dont know if this bug has been fixed. If not => Skydrive folder sawp trick and resync.
Sum up all those Megs and Gigs and compare it to your other storage (keep in mind the system uses about 465 Mb of Other storage by default.)
the size should be about the same size 200+ Mb is okay.
People tend to overreact even.it is there own fault sometimes. (Keep in mind Im talking about post GDR2)