Why does a Tengu user hate that stage? Nothing gets in the way of dive bomb.
Well, I hardly ever played on Tatami in DOA4, but in DOA5, where I play Bayman, I hate Dojo because of it's lack of walls.
Nothing ever interrupted the dive bomb for me in DOA4 anyway, other than the poorly designed, piece of shit 'Ninja Hideout' stage.
It's also worth mentioning that Tatami/Dojo eliminates Tengu's awesome 2T ceiling throw and I can't 7KP or 7PP people into a wall, or use his neat 6TP wall throw.
I mean, I can still see the stage being advantageous for Tengu, especially if he gets his 4P+K wind gust attack, but in general, I think the stage is awful.