the DMC-FZ30, or any other fixed lens non TTL digicam are not dSLRs.
Among several key factors that differentiate a dSLR from a digicam are the quality of the sensor. Assuming lenses of equal quality, many people don't realize that more megapixels don't always equate to better photo quality. It's the quality and size of the megapixels themselves (photosuites) that really make a difference.
dSLRs usually have sensors that are substantially larger than a digicam. This is why the picture from a 5 or 6 megapixel dSLR will often look better than the same picture taken from an 8 megapixel digicam- particularly as ISO speeds increase. All those megapixels get "crammed" onto a small sensor in a digicam and help to create the noise associated with many 8MP digicams. The Sony DSC-R1 is the first digicam to have a large dSLR type sensor in it, I believe, and all indications are that that camera produces very sharp and noise free images over a much broader range of ISO speeds than current digicams. Price however is quite steep for this camera.
That doesn't mean that you can't get pleasing pictures out of a camera like the FZ-30 however!

In the end, the digicams like the superzoom cams offer the ability to capture many types of moments not possible without spending many times more money for a dSLR and lenses that not only give you the same zoom range, but also offer the same glass quality of something like the Leica lens on the LUMIX models. The question is how much flexibility are you willing to sacrifice for sharper pictures with less noise? There is no correct answer for this. For most people, the simple economics of being able to capture a broad spectrum of pictures without breaking their wallet balances out the noise associated with all superzoom digicams.