Quoted from o-din:A lot of them really are. No ball save, game ending on a tilt, etc. Most of the DMD games you have listed, including STTNG, which I have, are a cake walk, relatively speaking. But I do realize a lot of people haven't spent much time playing these older machines, which might make the newer ones seem difficult.
My $0.02 is for EMs, too. I grew up playing and attempting to master the games from the 60's and a ball with 15-20 seconds of playfield time wasn't too bad. Nudging and skillful shooting with 2" flippers and scoring 1,000 points on a game with pops or rollovers that give 1 or 10 points (if lit) is HARD. It's part of the charm....watching a ball loop lazily off a ramp and head down the middle is both frustrating, yet exciting because next time, just next time, you'll be able to bang the table just right and bounce the ball back into play without tilting.
I have a Bank-a-Ball and a Slick Chick...both challenging, yet so rewarding when the rare 1,000 point light illuminates. Also have a TOM (on hard settings), which, although difficult to fully conquer, remains the favorite of the younger crowd that plays the machines.