As a owner of most of the 3 series ML amps 331 332 335 and 336 (never got my hands on a 333). The mid range and the highs and clarity are very good. The bass is ok, but not great. the Krell bass slam is better. But not by huge amounts. Where the mid and highs of the ML is a lot better. For me ML worked best with Transparent cables and interconnects.
If buying a used ML 3 series get it recapped at one of the ML repair centers well worth the money spent.
good luck