It sounds like you've never played a Treasure game. And Treasure's games are extraordinary.
Dragon Drive, Stretch Panic, and Light Crusader are extraordinary, yeah.
I've played plenty of Treasure games, and I've played them plenty long enough. Gradius V, at 80 minutes long, is too goddamn long for a shooter; it's the game's biggest flaw. Especially when you consider the fact that it loops.