You can't react to 4{A} because it looks very similar to {A} and Ein attacks differently from each. You can't react well to {B} because I can use BB. It's very difficult to evade {B} after confirming I'm not doing BB. Possible, yes... but you won't see that reaction often, even from top players. They might guess based on your play style, but they won't be acting on reactions alone like you can do with 1{B} or something like 66BA.
I do find it funny that you think Ein is good at mid/long range, while others are complaining he lacks range. I don't agree that he lacks range, but clearly there's something wrong with those two varying opinions.
Zwei actually does kinda lack range. Other than his EIN attacks, his range kinda sucks. Yeah A+B has range, but some characters kill him for using it. Even still, i think he's best played at mid/long range, because that's where he's safest. The problem is, he can't really enforce that spacing because his tools suck.
And you actually can react to 4A, the animation is different than A. I'm pretty decent at sidestepping after 4A and I have very little experience fighting against Zwei. The game has only been out for 3 weeks, I think its a little early to start assuming that just because people aren't reacting now, they won't in the future. Even if 4A and A was an absolute unseeble 50/50 (which its not), Zwei is still gonna lose in the risk/reward ratio.
Lets say the opponent makes 2 decisions after seeing 4A/A, purely random .
Decision 1: Sidestep and punish.
Decision 2: Do a beefy TC move.
In the case of
decision 1:
-If Zwei does [A]: You land the EIN for almost
30 damage after CH. You get minor frame advantage.
-If Zwei does [4A]: You take a lot of damage. Somewhere in the range of 60-120 damage, depending on character.
-If Zwei does not summon EIN: You can block their attacks, but probably won't be able to punish.
Risk/Reward Ratio: In the range of 2:1 to 4:1 against Zwei.
In the case of
decision 2:
-If Zwei does [A]: You take a lot of damage. Again, character dependent. 40-120 damage.
-If Zwei does 4[A]: You land EIN, get a pretty decent combo. 70-140ish depending on how much meter you use. This is of course assuming you land 4A on block, if you are spaced or they duck, you're screwed.
-If Zwei does not summon EIN: You MIGHT be able to block. 4A is -16, so some characters are still gonna hit you, some very heavily.
Risk/Reward Ratio: About even. But keep in mind that this is not truly a 50/50 so reaction time is gonna shift this away from Zwei.
As you can see, A and 4A is not a mix-up that really benefits Zwei against a experienced and knowledgable opponent. So what else does that leave Zwei? You don't use 1B in punish range, you don't use 66A+B when it can be stepped (which is mostly wake-up). I just showed you that A and 4A is not a winning mix-up. What tools does this leave him once they get close to him? Yes his B series and A series are good, but you're aren't going to win with just that. In order to get real damage, you have to do his unsafe stuff. You really have to outplay/outguess your opponent to win when they know what they're doing.
Don't get me wrong, I still play Zwei and I'm constantly trying to get better with him. It's just that with every tactic I learn to use, I think about what the counter to that tactic would be. And in almost every situation, the opponents counter measure is usually more rewarding than the reward that I'm getting for using that tactic. I still win most of my games against skilled but lesser opponents, but when I start trying to use that stuff against top Nor Cal opponents, I get destroyed. And they don't even have much experience against Zwei.
Honestly, if you really think he's so good, I would like you to explain some of your tactics to us. Heres a few questions i have:
1) What moves do you use to get most of your damage?
2) How do you keep opponents from rushing you down, assuming they know not to wrecklessly run in when EIN is available?
3) Once they do get in, what do you do to get them back out? (If you use {B} to push out, what do you do afterwards to stop them from coming right back with EIN on cooldown?) If you prefer to stay up close, what moves do you use to dish out your damage?