While I will be the first to say that I don't have the "true" shmup doctrine memorized, I've noticed trends in the shmup community that make me question why at least some of these games aren't considered for things like top 10 lists and so forth. I know that autoscrolling and two directional movement are big issues in what is considered a "true" shmup, and that these two things alone have caused a lot of arguments with games that use push scrolling (Defender, Sinistar, etc). So that's where I'll start.
Those two very big areas are met with games like Space Harrier and Galaxy Force II. You're forced to scroll into the screen at all times, and you can only move up, down, left, or right. Now, I know that many 3D shmups have some kind of speed control. This allows you to move through a level faster or slower. But the reality of this is, that speeding up and slowing down doesn't really affect the gameplay at all on older 3D shmups (newer ones like Star Fox and Panzer Dragoon are another matter). Sure, you can hit the throttle on After Burner II, but all you're really doing is making the game go faster... like running MAME at 130% instead of 100%. The enemies still fire at you when/where they normally would, they still take their pre-assigned paths, and such a boost doesn't grant you much beyond having a better chance to get out of the way of the bullets/missiles... which is exactly what speed ups do in top and side view scrollers. We've all played games like Gradius and Thunder Force IV, where you can adjust the speed of your ship to maneuver through tight spaces, or zip out of the way of a bullet spread. Now granted, with 3D shmups, such speed ups also make the level go by faster, as you get through the levels obstacles and enemies at a quicker rate. But I've always seen this as part of the gameplay, much like how the longer you survive in many shmups, the more shit they throw at you as the levels progress. It's just that with 3D shmups, you can choose to go slow or fast, without missing out on the attacks, level designed obstacles, or bullet count.
Another point I'd like to make is that the viewpoint from which the action is played out, shouldn't be a factor in deciding what is or isn't a shmup. If you were to somehow take a game like Thunder Force III, turn it 90º so that you were flying into the screen, but you left all the gameplay intact exactly as it was (except for switching the speed setting to Z-axis instead of the X/Y axis), would it still be shmup? For me, the answer is a very easy "yes". The reason for that is, that if you took Galaxy Force II, turned it so that it was a side/top scroller, and left the gameplay the same (but switched the Z-axis speed setting to the X/Y axis), I don't think anyone would have an issue with calling it a shmup. It's that Z-axis that seems to really stick in the craw of some folks, while the many other similarities get overlooked. Plus, I simply don't see that change from X/Y speed ups to a Z speed up as a deal breaker.
We all know that some shmups have quirky traits. Zaxxon has it's funky viewing angle, Granada doesn't autoscroll, Zaxxon's Motherbase 2000 allows you to jump onto enemies and take their powers for your own... and I'm sure others could name more shmups that have some trait that cause people to cock an eyebrow when that particular title comes up. I know that there are entries in this genre that simply won't make the cut. However, I feel it's time for the genre to looked into with more scrutiny, as I simply can't believe that the likes of Galaxy Force II, After Burner II, Space Harrier, and even Zaxxon 3D, aren't shmups. Or more specifically, that they're some kind of oddity in the shmup world that don't count for the various things that go on here.
I know there's a lot of opposition to this idea, and I also know that some of the older members are likely sick to death of this topic. But I'm hoping we can keep this civilized and open, without resorting to "it's already been decided /thread". Things have changed before, and I'm interested in seeing if they can be changed again
