Why do you dislike it? Is it because of the name? What if they had another guild that was muscle for hire and called it the Warrior's Guild? How would that be any different or better?
Or is it what they do that bothers you? Or is it the implementation of those quests?
A different name could be cool, certainly, but essentially what I found lacking with the Fighter's Guild in Oblivion was that it was sort of generic in the sense that the overall quest line and backstory were not as engaging as the corresponding elements of the Dark Brotherhood or the Mage's Guild. The Thieves' Guild questline I have not yet completed to the end, so I cannot comment on this one.
The Fighter's Guild was a sort of generic employment office, and in its place I would like to see perhaps 2 different rival factions favoring the warrior class, ideally in a deadly blood feud with one another, where quests and intrigue serve to deepen the story of this conflict, rather than simply being a series of odd jobs. We could be talking about mercenary groups like the Blackwood Company, or a group of dastardly Skyrim bandits raiding travelers or merchant caravans from Bruma, etc.
I just really do not want to hear any NPC tell me "The Fighter's Guild is hiring again"
Instead, could you imagine some brilliantly written quests on the level of a "Whodunit?" involving rival warrior factions?