>>11813059
My take as someone who played the original trilogy on a Powermac w/keyboard controls, as well as several fan made scenarios (Tempus Irae, Evil, Eternal, Rubicon, Red, Phoenix.) Enjoyed the games for what they were, but pretty much forgot all the stories within a month or two.

If you're new to the series, M2 is probably the easiest to get into. It's colorful, it's open space, and you're dropped into some some light action.
Infinity is good, but kind of starts off slow. Level 1 begins in a big claustrophobic maze, then moves into some bothersome areas.