I have mint 6300 and it performs well and sounds good. Not high end but very good.
It's price on the the used market is high and some people put it down for that. It has many nice features such as tonearm VTA, lateral adjust, a nice anti skate, auto lift and shut off without the extra return mechanics, solid quiet DD motor, mute switch, overhang gauge, nice headshells, and it can handle medium compliance stylus. I think it looks great. It even has adjustable feet for leveling.
I think the lower models are ok.
Marantz pricing in general tends to be higher.