I don't like Tau models since they are like anime and what is anime doing in a universe with completely different style.
Don't be fucking silly.
For a start, 40k is all about inclusiveness, multiple aesthetic styles, sometimes clashing, sometimes complementary.
Plus, so what its anime ? Thats a genre as broad as any. I might hate some aspects of how the Tau are handled in the background, but I've come to appreciate that its mainly not because they are "anime", its the same reason any race's background irritates me, the lazy way they are "sold", every race jobs to the owner of the codex, and the Tau get a lot more of that, simply because they are worked in as a smaller civilisation, but still sell enough that GW want to push their models, which clashes a little with a race thats supposed to be stuck in the wilderness of the galaxy, there but for the grace of a distracted Imperium.
The happy fluffy aspect of the Tau is pretty much a veneer at this point, not to generalise, but the Sept in Deathwatch is full on Grim Dark. Explicit sterilisation of human populations, banning of religion, active "re-education" of dissidents, and rumours of psychological experimentation on capitive populations, as well as using their subject races as test subjects, willing or otherwise.
Plus, as a tangent, Kroot-Cows. MOOOOOO-SQQUAAAAWWK!!!
Also, Tau models are awesome. I drool over the Forgeworld battlesuits as much as I do the other stuff, and Firewarriors are great.
Hazard Suits would probably hit my top ten fav models.
Srelex
What 'style'? Each army has its own style. Hell, the Eldar are also sleek and smooth--are they 'anime'?
Its difficult to deny that there is some serious Anime DNA in the creative thought behind the Tau, hell, the big piccy they had up of some of the stuff they were looking at for the Tau at Gamesday years ago had a Gundam on it.
Watching Appleseed, I can see a lot of that in the Tau battlesuits and firewarriors. The proportions of the battle armours, the antennae and multi-lense sensors etc. Briarios in his suit wouldn't look out of place at all in a Tau army.
Its completely a coincidence, but the Air Caste guys have the body proportions of Code Geass people as well, which is pretty funny considering things.
Also, if you don't hear someone shrieking " ITS A GUNDAAAAM *KERSPLODE*" when you look at the Tau Commanders and Battlesuits, you probably don't recognise the visual cues for asian stuff in Eldar. (okay, this one might be a little more subtle, lets try Death Korps and WW1 ?)