12% faster attack speed
Depending on what you mean, that's not true. By default you have 124% attack speed at level 15, if you've got a mageslayer it's going to raise it even more, so in a UB vs. UB fight it'll be close to a true 12% increase, but in any ohter situation you're looking at a true increase of 6-8%.
I mean really it depends on the level and items we're talking about, but I just wanted to point out that default attack speed isn't 100%.
And of course don't try the build out first before commenting how crap it is. That's would be ridiculous.
I've played it before. Ooze is not a new build, the only thing new is playground's over the top presentation of it. I appreciate that you edited your post to say "The argument I'm trying to make" instead of "The argument here," so I see that you do undertsand the tone of the OP has had a negative impact on the overall discussion here.
Ooze is fine. It's a more durable but lower DPS build than a hybrid, and some people prefer that, to each their own. If this thread had been worded differently there wouldn't be any debate at all, as there's been plenty of talk of ooze builds before.
However, when you resort to absurd things like "Factor in priests, and honestly spits slow damage is hardly even noticeable," you undermine the validity of your side of the debate. In a pure Ooze build clearly Ooze does a lot of damage. Max rank Ooze does 140 DPS, max rank Spit does 150, and with Purtrid Flows it does 250 for at least 5 out of every 7 seconds if you've picked up a BotS so you can afford to keep spamming it. Spit does a LOT of damage, period. It's more than the autoattack difference is going to amount to until very, very late game, and more than Ooze.
Even at level 20 with a Mageslayer UB with stats is only at 540 autoattack DPS. Assuming 40% mitigation, that's 324 DPS. With the same gear a non-stat UB does 470 mitigated DPS, or 282 DPS, a difference of only 42 DPS, hardly comparable to the 150-250 Spit does, and that's not even counting in the DPS gain from the Blade of the Serpent.