... im not too sure if I should be offended...
You shouldn't be offended! There's nothing wrong with trying to apply knowledge you already had to a new situation! It's just that tier lists don't really work for shooters.
It's not that all weapons are balanced or that some things aren't better than others, but a tier list is simply incapable of including the nuance involved in rating weapons and isn't really of much use to people anyways. Here are some of the reasons why:
Weapons all fill different roles. It's not really possible to compare the E-Liter to the Splash-o-matic because they do completely different things.
You have teammates who can cover your weaknesses. You can't say "well this weapon is good at everything therefor it's better than that weapon which is amazing at this one thing but sucks at everything else" because being amazing at one thing might be enough to make a weapon more useful in some strategies than a strong allrounder. Some weapons which are also "bad" on their own might become used because they complement a "good" weapon.
Which weapons are strong can change drastically depending on the map, if you're attacking or defending, or any number of other circumstances. For example I imagine that if blasters become the meta we'll see blaster players all switch to the rapid blaster (or one of the other long range blasters coming out) when playing on arowana.
Unlike fighters, weapons take very little time to master. If you can use an N-Zap, you can probably use a SSP. In fact you're expected to know how to use all the weapons for your role. You'll also probably be expected to be able to play one or two other rolls too, in case your team wants to change things up in a match. In fighting games where it is a big time investment to learn a new character tier lists can be helpful for knowing which characters are good time investments, but you don't need that for a shooter.
I really wasn't meaning to offend anybody, all I was saying was that I've been playing competitive shooters for a good amount of time now and the way everyone is approaching Splatoon is really different from the way people typically approach shooters. I think this is pretty cool because looking at things from a new angle can help come up with new ideas, but it can also be problematic if people don't realize that you have to approach shooters in a different way than you approach fighting games.