I have only heard good things about him as a theologian from others, though I must say I didn't find the one volume I read by him (in translation) particularly memorable.
I wonder if people prefer him b/c he's succinct & doesn't stretch the theology too much. Things like b/c the Holy Trinity is a dialogical entity, we must be in dialogue with everyone (and their mother).
The first part is truth..the second part is quite the extrapolation. Makes you think huh...lol.
But to my point, I wonder if that's why Staniloe is preferred reading.