I've had this one on my mind for about a week now. It's definitely strange, as is the current selection for the Monday Morning MAME Club, but a different sort of strange. For those unacquainted with the series, Sengoku represents the best damn martial arts/swordsmanship beat-em-ups ever, in terms of style at least. You've got "spirit helpers" who you can summon to take your place (but who aren't really substantially more powerful than your default player), lots of swords (or two sword attacks, depending on the game), and you shift through planes of reality - both modern-age and areas filled with traditional Japanese mythical creatures - so fast you might start getting fatigued!
Pros of the two main games:
Sengoku has arguably better ambience, and the spirit helpers look more natural than Sengoku 2's. Plus it doesn't have any funny looking soldiers. Don't forget the nighttime beachside fight (remind anybody of an iconic Samurai Shodown locale) with the second to last boss!
Sengoku 2 doesn't have the variety of swords the original has, but its high and low cut attacks are arguably more useful. It's also much easier than Sengoku, which was so incredibly hard that a whole team of practicing Neo Geo ascetics lost half their number to fatigue, starvation, and severe emotional trauma before they finished.
Sengoku 3, the 2001 "sequel," really isn't worth anybody's time, but I'll include it anyway.
It's a poll, so sound off!