| IMO and IME, it is actually the opposite of what you would think. With the powerful, interactive tone controls, and the way the gain and volume settings impact the tone controls, I find the Streamliner a tweakers dream. It is NOT a 'pull it out of the box and play' sort of amp.
If you want an amp that is 'plug and play', the Markbass heads (the LMIII or F1) are pretty much the top of the heap for that. Most play those amps set virtually 'flat' (i.e., filters off, EQ at noon), and the preamp clip light lets you quickly dial in the optimum gain setting. I rarely have to touch a knob on those amps, except when in extreme venues (huge, boomy rooms etc.).
The number of knobs has very little to do with the level of baked in voicing or complexity of the EQ circuit.
Edit: Also, if you thought the Shuttle was 'terrible' (actually, if you think any amp is 'terrible'), my guess is that is due to user error and not understanding how the amp works. You can get most amps on the market to sound 'relatively' close to one another if you spend some time with the manual, etc., and have decent chops to put a good, clean, signal into the amp). | 
