So besides the purple color how does he look like Isaac Ooze you ask.
He's obviously not purple. He's light blue. Grayish-blue, per Oscar Isaacs.
He doesn't look like part human part machine. He looks like a human being with face paint on, wearing a suit. Now compare that to what we know the real apocalypse looks like, the real Apocalypse looks merged together with his machinery. It all looks apart of him.
Apocalypse clearly has machine-like elements blending with various parts of his form. Nevermind that the real Apocalypse doesn't so much, in his normal form, actually look like he's merged with machinery so much as that he's just really big, and is eventually revealed to be able to transform parts of himself.
Well first off he looks very corny.
"Corny" isn't really a visual element of a design. That's more of an opinion about how well a design works, not an inherent part of the design itself. And I think we could make an argument that Evil Muppet Comic Apocalypse also looks pretty corny at times, so in terms of not being faithful because he's kinda corny looking? Can't say I agree with that.
The Apoc in the movie looks to be wearing something like shoulder pads.
A quick glance at most comic book versions of Apocalypse will reveal that yup, he also generally is depicted with "shoulder pads/armor". So this is actually something that makes the movie design a bit more faithful.
Next look at the head piece. It is a very similar shape and angle that is shaped in a V over the forhead and then slants over the eyes. They have the same basic shape and angulation. And because it doesn't resemble what Classic Apoc has, which is no helmet, it looks closer to Ivan ooze than it does to classic Apoc.
This is one of the few similarities they share. A basic shape. And that's all well and good, but "this character also has a hat" is not nearly enough to objectively say "That's the same visual". The vast differences in the nature of their headgear makes this something of a wash.
Because:
-Ivan Ooze's is this raised, organic purple thing with pincers and long, thorny tentacles extending out to the sides and back of his headpiece.
-Apocalypse's headpiece is form-fitting, sleek, and clearly not meant to be something that was once alive, but rather more machine-like.
In other words, the inherent concepts and visual motifs of the two designs are almost completely different.
Now to me the most glaring of features is the pointing piece of the helme that stretches down the cheek and below the eye of movie Apoc. Ivan ooze also has a piece that stretches down below the eye and down the cheek at pretty much the exact same angle. Classic Apoc has nothing like this so in this instance movie Apoc resembles Ivan ooze more than classic Apoc.
That pointy piece of helmet extends down and connects to the lines around his lips.
It is, in fact, a clear visual nod to comic book Apocalypse's design. Yet again, a quick glance at most versions of comic book Apocalypse will reveal that yup, he has a blue line/piece of trim extending down along his jaw from the side of his head. So again, this is another thing that actually makes this design more faithful to the comic book look, not less so.
I can't really respond to the rest. I didn't understand most of the bit about the numbers of Ooze characteristics making something look like Ooze or not.
You cannot accurately assess the visual components of two different designs without taking into account the similarities AND the differences.
Ooze and Apocalypse are almost the opposite or markedly different conceptually in almost every significant visual element of their design, except maybe for their noses.
In fact, their noses differ as well. Ooze has far more of a "hook nose" look, and Apocalypse has a straighter nose.
And don't get me started how different their outfits are. You know, the other huge part of the design below the head...