Have we actually gone over actual reasons as to why every banned weapon is actually banned? I understand some are obvious, but there are weapons that get banned then later we're like, "oh wait, this weapon is actually viable in enough ways to allow it."
Soda Popper - banned
Let's look at the important stats of this weapon. It shoots 10 pellets each time you shoot, which is only twice before you're forced to reload. Point blank this can do up to 105 damage. Medium range can do up to 67 damage, and long range up to 11. Without mini crits, it's still a two shot weapon in the same situations as the Scattergun. With mini crits, it does up to 14.2 a pellet, or 142 maximum damage total. This is with a 100% meat shot while you have mini crits. Lowest damage with mini crits you can achieve while hitting every pellet is 81 damage (8.1 damage per mini crit pellet).
The weapons reload speed is 25% quicker than the FaN's, sitting at 1.23s. The Scattergun reloads one shot @ .76s seconds, or 3.56s for all 6 (first shot reloads slower, or otherwise it would be 3.36s).
Those are the more important number value stats. Going solely off that, without mini crits, it works the same as the Scattergun except with less shots loaded, meaning potentially a bigger risk for missing. It reloads both of it's shots quicker than the Scattergun can reload all 6, however. Going solely off of numbers, the "bigger risk" for missing isn't really all that big, but then you need to put into consideration how well the players can aim. NUMBERS THOUGH.
What can the Soda Popper do? Running for ~13 seconds constantly will completely fill your Hype Meter, allowing mini crits on all of your weapons for a pretty short time.
pros: Mini crits albeit short amount of time. Time between shots compared to Scattergun is slightly quicker. If your shots are dead on, you can typically do more vanilla damage (no mini crits, kritz/crits, etc).
cons: Reloads slower than Scattergun unless Scattergun is reloading all 6 shots, though reload time becomes quicker than the Scattergun's once the Scattergun starts reloading a third consecutive shot. Soda Popper only has 2 shots loaded at once.
Looking at this weapon for what it is out of a player's hands compared to the most used Scout primary in 6v6s, the Scattergun, it's kind of even. Mini crits, more damage and faster reloading compared to SC only if SC reloads more than 2 rounds. On the flipside, it only has two rounds loaded, reloads slower for a short period of time compared to the SC and players don't have a choice when it comes to activating the mini crits.
Now when in a player's hands, the number values and such still play a factor obviously, but it completely depends on who the players are exactly. Can both players aim as well as each other, or nearly as well? Can the SC player aim better or can the SP player aim better? Can the SP player position himself well enough to make actual use of the mini crits, or is it an off and on situation completely depending on what's going on in the game?
In the end it really only requires actual play testing and not just a couple pugs and it be over with. When you look at the numbers and the additional SP effect, the SP sounds like it could potentially be a lot better, but ultimately it pretty much just depends on who's using it and how good the players against them are.
So I guess what I'm trying to say is that the Soda Popper is a quick example of a banned weapon that could very well find a place in the norm but was banned pretty quickly after release (yes, I understand weapons released mid season get auto banned). And no, I'm not really a fan of the Soda Popper, I just picked the first weapon I saw that I wasn't exactly sure as to why it's banned.
ps I'm sorry if this all sounds like a lot of mumbo jumbo, but I really need to hit the hay. I should not try to think so hard when I'm barely awake s: