oh yeah. AP sona is great lol. Getting hit by her Q and then the powerchord AA is harsh. But yeah. She scales well with AP. nami does not. nor does she have the amount of poke sona does.

While Nami can go solo lane mid, and do decently, there are far too many ways that things can go wrong for her to ever be viable there. She lacks burst, a key aspect of mid lane. She has great sustain, but can easily be bullied back by her long cooldowns and lack of good damage. She has great CC, but again, it's on a rather high cooldown.

It's like playing Lulu and Soraka mid. Sure, you can do it, and you might do fine, but there's a much higher chance that you won't do fine, and she does better when she has someone she can help.

The support role has very limited champions, so the community disapproves of having those few options taken away by other roles.

Also, from what I've heard (haven't tried it) taking Nami mid is just a bad idea in terms of win/loss ratio for your team.

no minion clearing skill, forcing her to auto-attack to farm (which is sub-optimal)

That's why you don't rely on W too much, do you see any AP mids using their other high mana cost spells to poke? No, same goes for Nami, only use it to heal yourself and hurt the enemy in a heavy exchange, to poke them Q is viable. If you think Q is that hard to hit, well I don't know what to say, I hit them quite a lot while anticipating enemy movement. It's the same as Anivia stun, how do people land those? They're easy to dodge, you just have to anticipate movement, it's a skillshot, the word itself is its own meaning. Plus with a little AP her Q can clear minion waves, and her E helps you last hit easily. I've played mid nami twice and carried both games haven't tried her anymore than that, so I'm still not dead set on her abilities as a mid lane champ, but from what I've played I've done fine, carried my team to victory, so what's the problem?

I never claimed the latter, I just said it was viable from what I've seen and played, your forced sense of sarcastic humor there is quite cute though.

She has poor farming, and her AP ratios are lackluster.
She's weak in comparison to other AP mid champions while as a support she's on par with the others.

She's a support. You may aswell be asking why people dont play Sona mid.

as long as the nami players tells you in pre lobby and it is not ranked, then there is no problem. People need to calm down, it is fun at times to try to play champs in unconventionally.

When a champ comes out, that it the best time to play unconventionally because people haven't learned how to play against them.

All I care about is someone trying. If they are trying and not purposing trying to lose, I'll take that. Its better than the trolls who just rage and die on purpose.

The winner of the handicap olympics is still handicapped.

Mid Nami, and for that matter mid Janna, are bad picks. They are not viable except in VERY SPECIFIC team comps. Aka, they are not solo queue picks. If you do that with your arranged 5s team more power to you and I hope you do well. But if you do that in solo queue you're just holding your team back and setting your team up for a hard game where they have to carry you even harder than normal.

Your anecdotal evidence does nothing to support your claims. That evelynn was most likely bad as she should've easily won that lane. Midcrank can work as he is natively tanky and has close to the most CC in the game on a single character AS WELL AS burst damage.

Nami has 1 CC besides her ult. She has no burst damage at all, and barely any real damage that isn't minor harass. She cannot kill an enemy unless the enemy messes up really bad. Snowballing as nami is also rather pointless as you don't get that strong. You would be better off with diana, akali, orianna, swain, any other strong AP champ.

Mid janna used to be good before they nerfed her ratios. Now she doesn't have the damage to be a strong part of the team unless you're doing the 3 support + mundo and kog comp. But again any good midlaner will just destroy you in lane now.