I can tell that the Raiden III bashing is bullshit when those people think the first three games are
just fine for them.
Raiden is tough, though the player 2 side makes it easier. Raiden II has three different boards, but even the easy board feels harder than Raiden. The difficulty of Raiden DX depends on how you play it, and it can be easier than Raiden and harder than Raiden II; there's also its scoring to worry about. I think Viper Phase 1 is somewhere between Raiden and Raiden II.
The Raiden Fighters games are a lot easier if you don't bother with score. 2 is harder than the first. Jet, again, has variable difficulty and the game can end early. This series also has a large variety of ships.
Raiden III has an easier raw difficulty than Raiden, while scoring makes it harder; the R bug makes the game a little easier than it would have been. IV Light is easier than III, IV Original is much harder (because it loops), and IV 360/Perfect/Additional is harder than that. OverKill is more or less 360 with what is probably a harder scoring system. The Raiden (ship) can make IV a little easier if played right, while the Fairy makes IV... weird, I guess harder.
The various Raiden ports all have proper difficulties which greatly change the way each game is played. Raiden III and IV also have proper difficulties, and it should be noted that many people know the difficulty just below (which, unfortunately, is called "Normal") the standard ("Arcade"). It should also be noted that the higher difficulties of DX, III, and IV are never considered.
Is this for real?