A good fx loop is great for modulation fx such as chorus, delay, flanger. But not so good for fuzz fx.
However, the FX loop on my ampeg PF500 is rubbish. I have, for the first time since 1996, started to use a chorus and octave pedal (for Sledgehammer, owner of a lonely heart and a muse song) and it sounded muddy. So I just stuck them in the signal path and they don't seem to rob my normal sound (much). A small difference but not really worth worrying about.
When Victory amps bring put their bass amp, I have been assured that the FX loop will be fine. ( I play in 2 bands with Martin Kidd, the ex Cornford and now Victory designer)