It's one of the factions a warrior character might be interested in, and I intend to play one soon.

But from a first glance the Fighters Guild just seems as bland as possible.

they are a Merc group, so at the beginning it is a little lack-luster, just Jobs of clearing out Bandit holes or being a shops night guard.. but around half-way through it gets quite Interesting...

I won't tell you why because I don't want to spoil it, but towards the end there is a bit of a "wtf did I just do" twist....

For one they actually feel like a 'gasp' guild, with actual mercenary work. Once you get into the main quests it becomes a little typical and boring but as the last poster says at towards the end it does get interesting... no spoilers.

Heh. I saw that twist coming, but it didn't lessen the impact.

Yeah, just like the rest of the guilds it starts off pretty slow with certain requirements then slowly builds up to something more interesting.