Neither Iron Soldier game is on the Playstation or Saturn. Playstation got a sequel titled Iron Soldier III ported from the Nuon, but not either Jaguar release.
From my collection of games bought to play, I count several that I'd consider very good that were exclusive. Nothing I'd consider a system seller, but thanks to excellent versions of several releases that did appear elsewhere, I think the console itself is a worthy addition.
The CD attachment is much more questionable. Between their age and their escalating price in recent years, I'd have a difficult time justifying ever recommending that to someone new to the system (Particularly if someone doesn't get Cybermorph since the sequel is widely considered the top release for the CD add-on).