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A "my favourites/star-rated/bookmarks/whatever" tab
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For this at the moment i set the search settings to "arcs iv rated" and then obviously the top ones will have been my favourites 
An option to look for arcs NOT containing certain keywords (such as comedy) would be usefull.
Though i will admit that at the moment the search engine upgrade is a HUGE change from the one we originally had. Even just by clicking "my level" + "random" i have found some pretty good arcs 
@Damz Find me on the global channel Union Chat. One of the best "chat channels" ingame!
Ok, time to be harsh and evil...
So we got some new keywords for our story arcs. IMHO that's a poor substitute for a proper search engine. If Paragon can't do it themselves, they should hire some people to do it for them. Here's just a few examples of what people expect from a search option nowadays:
Search by author, by ID, etc
When a mission is found, look up other missions by same author
A "People that played this one also liked these missions" recommendation tab/option
and perhaps most important:
A "my favourites/star-rated/bookmarks/whatever" tab
It's amazing the MA got off the drawing board without this really...
Also, an option to rate the difficulty of the mission could be useful, maybe even see optional feedback people enter for each arc.
I guess I could go on, but... Point is: If you can't find the good arcs, it's just another farm toy. Oh wait...
...it is? Ah! It is!