The Nikon D7000 is great for HDR photography. Sure, the bracketing is limited to 'only' 3 frames, but I don't think that it's a deal breaker. The main draw when doing HDR on the D7000 is the 6 fps, this means I'm able to handhold and still get mostly decently aligned shots. This is good for situations where I don't have my tripod with me.
What's even better is the excellent high ISO performance that allows you to take steady shake-free images. Bear in mind that if you have auto-ISO on, the camera will vary the ISO to either maintain the shutter speed or aperture value you have set.
Yes, there are those on the forums that would rather the D7000 come with 5 or 9 frame bracketing. I'm not a professional HDR photographer... so I don't insist on 9 images at 1EV apart. For my purposes 3 frames at 2EV apart is perfectly fine since most of my shots are for personal use / experiments. I may change this opinion once I head out and do more landscape HDRs, but for the moment I think it is more than enough for my needs.