Krisair - Load factor in isolation will tell you how many 'bums on seats' there were, but in order to make a judgement on whether a route is a success (e.g. is profitable) there are so many other things at play, none of which are generally in the public domain. Even if a route is profitable in its own right, an airline may believe it can make a greater profit by utilising the crew and aircaft on other services. Many a seemingly successful route has been canned because of this.
Hope this helps