The BSD userland is horrible IMO. The kernel, not so much. It lags behind Linux when it comes down to drivers, but for what it DOES support, it is sometimes superior.
So yes, Debian GNU/kFreeBSD is actually very nice. When it works with all your hardware.
And one would have to ask people to compare Debian GNU/kFreeBSD with straight FreeBSD to know whether they prefer the GNUish/Linuxish userland or the BSDish userland, and compare Debian GNU/Linux with Debian GNU/kFreeBSD to know whether they prefer the Linux or FreeBSD kernel.
PS: "GNU/" prefix added because that's how we call these ports officially in Debian.