
Now unlike beat 'em ups, shoot 'em ups aren't such an exclusive group. But then again, last time I was really referring to an extremely narrow selection of games that has mostly died out nowadays. No More Heroes was brought up a comment, and I said I don't consider it a beat 'em up because it was "too different". I feel I should clarify what I mean, and better clarify how I classify a shoot 'em up in turn, because they are more similar in nature then just the names.
Both beat 'em ups and shoot 'em ups belong in the more general genre of "action games" along with other categories (including platform games like super mario world which my hack is based on). An action game in fact a rather vague and widely applied label, and all sorts of games could be said to be action games as long as they have, well, action. But beat 'em ups, shoot 'em ups, and other categories are not. They have a particular narrower meaning. And it's more in depth then their name would suggest also.
Both beat 'em ups and shoot 'em ups are defined partly by their roots, and partly on their focus. With roots it's primarily that beat 'em ups and shoot 'em ups get basic gameplay elements form old arcade games. Even if they tweak the formula and add new gimmicks, there is usually a definite heritage of ideas that can be traced back directly to an old classic. That is not to say new ideas aren't good and don't happen, it's just that you can see a definite evolutionary line. For focus it's mostly a matter of cutting out everything but one element of combat. In beat 'em ups it's close range combat, in shoot 'em ups it's long range combat. Almost everything outside this focus is usually more or less excluded.
Small side note: Fighting games are like beat 'em ups, except fighters focus on one on one and/or player vrs player while beat 'em ups focus on one vrs. many, and player vrs. mooks. But games can be considered both at once, such as the Super Smash Bros. series (infact I sort of count it as a platformer as well). I still don't think No More Heros has the arcade roots or the exclusive focus to be called a beat 'em up though.
Getting back to what I was saying, shoot 'em ups aren't necessarily as exclusive as beat 'em ups, generally because there are a lot more ways you can handle ranged combat and a lot more diverse classic shoot 'em ups that branched out into a lot of sub-categories. Beat 'em ups never really evolved past River City Ransom and were replaced with newer games that, while still action games involving fights with multible mooks, were totally different in execution and focus. Thats why there is nothing really as universally "wrong" with shoot 'em ups that pops up in most games. But there still is a problem I have with shoot 'em ups in general that has to be looked at.
I suspect people like shoot 'em ups a lot of the time not because shoot 'em ups are good, but because they are simple.
Oh sure, bullet hell games like (most of) the Touhou series are filled with mathematically complex patterns and can be insanely hard, but the gameplay is still brain dead simple. Now I know not everyone likes games like Dwarf Fortress where the online wiki is needed to have the slightest clue what is going on, and thats exactly why shoot 'em ups usually exclude everything but shooting. But there is a fine line between tightly focused and boring. It's probably just me, but I want something else to do besides shooting things. I have always thought Touhou's fangame spin offs like MegaMari were far more interesting. MegaMari isn't a complex game, but it still has so much more involved gameplay just because you have to navigate around and explore, things considered shoot 'em ups almost never do. Not that it's the best game ever, but it's still more interesting then the main Touhou games seem to me.
It's not that I hate shoot 'em ups though. I still find the main Touhou fairly fun, I just wish they would throw me a bone sometime and actually have something besides waves of bullets to get excited about. Any old game can do that if you let it.