Elaugaufein
Member
In the order they were released.
It will be hard going back to the older games after playing the newer ones.
D3Vita is still very playable. Disgaea2's postgame was even grindier than d1s when it came out and the PSP version of d2 did nothing to alleviate it, its probably the most luck dependent grind fest in the series. D1: PSP has glitch that let's you skip a looooot of grinding, D1

D4 was actually more grindy than D3(original or Vita) but the portable version is alleviating that significantly.