You didn't even explain what it sounds like. So that doesn't help anyone very much. Just because your not satisfied with Marshall's doesn't mean that they won't work for someone else. I don't like Marshall's either, but I'm not going to push someone to by a Fender because it works for me.
Jealous, go buy an EQ pedal, MXR makes a 6-band,and 10band, and BOSS makes a 7-band, and 10-band. If they don't work out for you, then you may want to consider buying different speakers, different amp, or other pedals to brighten up ure tone. I use BOSS Blues Driver, gain set to low, level and tone high, as a Treble boost.
Electric Guitars are the inspiration for cries of "Turn that damn thing down"-Gibson website