And Vayne is still considered to be the hardest to master ADC in the game.
Only cause of her Q and E alone.

Vi's Q needs a lot of skill and has a lot of usages and i would say this skill is way harder to use than any skill shot cause you use yourself what means you need ot think about your positioning a lot (who blocks it, whom do i hit, will the enemy avoid it, in which direction, ....). Her E is pretty easy to use, but a perfect timing is really hard (to trigger the CD as early as possible).
These 2 skills have way more possible plays than most other skills in the game. That is enough to make up for the W.

You would hate DotA. What's that? Entire abilities that are passive on many many champs? Intredasting...

Also Vi is great. Dunking left right and centre.

I'm sure you'd like Tiny toss, Blitz grab working on allies, a courier, the ability to buy when not in base and TP scrolls as well then.

LoL is all about less control than in other MOBAs. It's more limited, so it's simpler and more accessible and less trolly.

No, you only want to max his spikes second if you're going for an on-hit or more dps-centric build, because lowering the cooldowns on his other abilities are most important most of the time.

I definitely succeeded at fat fingering it off when casting her Q, must have been a bug.

I don't play DotA2 but in the way multiple people are describing it that sounds like a different scenario. When every character has a passive ability that's not removing control because there wasn't any to begin with. Denting Blows is removing control because almost no characters in league of legends have an ability that you don't interact with, so in comparison to 90% + of the champions in League you've removed control.

From an objective stand point it is. The ability doesn't add anything to the play of the character. You were going to auto attack anyways so having an auto attack only ability that you have no control over adds nothing, and removes some of the control you'd have on almost any other character in the game. In some cases like Vayne it doesn't feel bad at all because her kit is so perfectly tuned around auto attacking anyways. In Teemo's case it still doesn't feel as bad as Denting Blows because he's built around poke and flee. In comparison VI's kit isn't built around auto attacking so Denting Blows doesn't mesh into Vi's kit like Silver Bolts does into Vayne's.

Different strokes for different folks. Finding Vi fun is not wrong, everyone likes something different. Personally I don't find Vi fun to play because of her W. Though thanks to reasoned arguments in this thread I've been able to better extrapolate exactly why. (thanks guys!) My original post focused a bit too much on the objective aspect but on further thought Vayne has the same objectively bad design in Silver Bolts but is fun to play. The difference is their kits, Vayne's synergizes well with the on 3rd hit effect, Vi's does not.

teemos poison IS his damage, again with the vayne thing aswell, you may aswell make that her passive and get her ms steroid as an active, which would be stupid. teemos got an interesting kit, hes a fast moving DoT annoying ass. his poison has NO issues you just dont like toggles. and about the cho'gath, his toggle is a TON of his early game damage, as well as late (if playing ad/on hit) about the post above, teemos poison doesnt remove control. i dont get why you would say that. it only really adds it, his poison helps a lot with his kit. hes based on poking, so why would it make him have less control....