>>531219585
It's a pretty good starting point, except for one major event it's pretty isolated, and it gives you a great view of the series' strengths.
With the exception of 10 and maybe Kichikou you can kinda play them in whatever order really, there's always returning characters that you'll understand better having played previous entries, but it's never a necessity, and considering that 01 is good but pretty tame (the series was just a different, much simpler affair back then), 2 is dogshit (in every way), 4 is really outdated, and 5 is dogshit (gameplay wise, playing them in linear order isn't necessarily the best choice.