I have often wondered about how my gaming career would be different if I had started on Palladium Fantasy instead of D&D. Many of the features of that system are common to others of its type: overgrown attempts to fix problems perceived with D&D. Palladium has a wider range of classes (magical and non-magical are both expanded), a wider range of races, percentile-based skills, target-number-based armour class, more (and higher) attributes, et cetera. I mean that with much love; that's the prevailing attitude that has fuelled much of the gaming industry. My own Midian has all of the above (with the exception of percentile-based skills, which Palladium made me loathe), and I hadn't encountered the PFRPG until I already had a few systems I had already designed. This is what makes me wonder how my gaming would be different now, because if I had started on PFRPG I wouldn't have had to spend all of that time drawing the same conclusions.
It's ironic, but even though the new version is better organised & cleaned-up from the original, I still think the original was arguably a simpler system to learn for a first-time player, every O.C.C. with its own combat skill, gnomes as hard to kill as the trolls that ate them, & all.