Marshall amp designs are great!. Some of the best rock/blues tones ever, from hendrix to page to slash, were achieved with marshall amps....
Unfortunately, these days......they kinda suck :|
Their amps are overpriced and their newer designs cant compare with the old plexis and original metal-face marhsalls. They're using cheaper materials, and are sacrificing quality for profit margins.
If you want a kickass amp and you like marshall tones then you should definitely check out some of the marshall clones out there. IMO, ceriatone amps are godly, and cost a fraction of what an original marshall equivalent would. They're also hand wired (as opposed to marshalls PCB circuitry) and use better components. And as if that wasnt good enough, you can even have your own mods done by the ceriatone guys!. I got a JTM45 from them back around christmas, with an added master volume and it's insane!. The assembled electronics, (everything in the head, except the enclosure) and shipping from malaysia cost me 600E. A marshall reissue would cost me close to 2k here!. They can do cabinets as well, but it ups the shipping cost quite a bit.
Summary!.
Marshall amps good!
Marshall bad!
Ceriatone good! ugh ugh!