The FM3 stock presets sound pretty righteous to me. Beats the pants off of the other modeling gear I've been using since 2001. BUT, I get not enjoying the stock presets and this thread isn't about me.
However, I think it should be noted that expecting to love a piece of gear's tones without any tweaking is a bit out of touch. We change strings on our guitar, choose the pick we want, mess with pedal settings, adjust amp EQ, etc. All these things are done to personalize our sound and it's no different on a piece of pro gear like the Fractal FM3. Yes, absolutely, anybody should be tweaking their sound!
I know the OP is gone, but there might be a corollary issue of not liking the speaker he's using. I definitely get this, and I'll regularly rotate amps/speakers to keep my ears fresh. I have a 2x12 guitar cabinet, 2x12 bass cabinet, two 6" studio monitors, and a little practice amp. Changing which ones I'm using is fun, keeps things interesting, and encourages me to listen.