I personally love Veronica Mars ... But I view it as a completely seperate entity that Buffy.
It gets a lot of Buffy comparisons, because so many cast members of Buffy moved over to Veronica Mars, like Charisma Carpentar, Alyson Hannigan, etc. But actually, it is totally different.
Its a great, witty, fast moving show, about a smart and capable girl.
Like Buffy.
But everything else? Very, very different.
I would reccomend it -- But as just a show, not as the "next" Buffy, or an "spin-off" or something.
I was very, very hesitant before watching it ... It took me ages to watch Angel as well. I love Buffy so much, that when Buffy fans start raving, it, for some reason, freaks me out.
But then I watched it, and I was hooked, and I loved it.