i don't claim that they are a cake walk, but let me tell you this. when i frist watched a guy playing dodonpachi in the arcades back in 1998, i've thougt that this must be the absolut shooter god on earth. but in fact he wasn't, until i tried it out.
in other words, they can be very challanging, especially when you throw in the whole chain system and stuff, but so was an R-Type, 11 years before that. after dodonpachi it went even crazier. when i got my daioujou, i've first thougt this must be a joke.
i don't say that they're easy, they're just different in play mechnism. but how they have developed, i don't really have to like.