I LOVE these guys!
I think these videos are pretty intriguing, and I agree with much of what he said concerning the series; PSI was just groundbreaking, PSII
IS super hard to play (but has an amazing storyline and is totally sci-fi), PSIII isn't
really Phantasy Star (I am of the consensus that PSIII is Phantasy Star with moustaches and harems), and PSIV brought back that "magic" felt from playing PSI. There's no denying that PSIV, while almost too easy, is incredibly compelling and engaging of a RP game. I never played the PS Online series, so I can't comment on those.
I have to agree with the guy in the videos regarding the original 3D caves; I prefer them more than the overhead view. The 3D caves seem to be more of a realistic experience to walking through a cave, as you're not sure where you're going or what's ahead (unless you use the cheat maps!). You never know WHO or WHAT is right around the corner (see my avatar), and that makes a particularly exciting game playing experience. The preference of the 3D cave design is more about the anticipation associated, but that's just my two cents.

Thanks for sharing this, Gryz!