Some people like it, some people think it's a real let down. I drove mine stock and was surprised by how much it smoked it's tyres in corners, felt like a boat compared to the Gallardo or Ferrari 430 / 458 in stock form.
I'm sure once tuned it'd be a good car, but for some reason it just don't feel right in stock tune, whereas other cars of similiar performance don't seem to struggle as much as the Lexus.
That's what I found, along with some other people. But I'd say it's got potential.