I don't want to upset anyone, but after having a game at Marks (Marta Hari), I found it extremely easy and boring. I remember plaing these games and thinking they were fun, but since the advent of DMD, I can't get into them. I reckon I could have played this game for ever without too much trouble keeping the ball in play.
Sounds like the MH needs some attention then. Because all those late 70's Bally symmetrical layouts had pretty unforgiving outlanes. It should be the case where you can kick it's arse one minute and the next it will make you look like a noob.
Mata Hari and Hot Hand needed work. In all fairness, comparing a reconditioned DMD to a reconditioned (or non reconditioned) SS or EM is not an even playing field. To get an SS up to a standard of a machine 17 years its junior requires more time spent on it.