Is the Nikon d50 camera good?

How is the quality of the pictures? & so on…

Well, its an older camera, but still can produce good images, as long as the photographer knows what he or she is doing.

Look at the newer model cameras, namely the Nikon D3100 and D5100

Yes. The quality of the images are directly related to the skill of the photographer using it. If you have skills? You will get great photos from any DSLR. If you don't? You will get ok photos from a DSLR.
Are you aware that the D50 is a bit outdated? It was introduced in 2005 and replaced by the D40 in early 2007. Which was replaced by the D90 in 2008. THat was replaced by the D7000 in 2010.

Yes, it's a good camera, although a bit dated. But if it's in good condition it can give you magazine quality photos if you know how to use it.

Nikon D50 extends most of the capabilities of the D70 down to a lower price point and in a somewhat simplified format that seems intended to capture the hearts, minds, and pocketbooks of the vast "family photographer" market. As you'll see in the review that follows, the Nikon D50 provides a superb combination of ease of use and advanced features, in a trimmer, more compact package than the previous D70. As the digital SLR market continues to move more mainstream, the Nikon D50 appears perfectly poised to capture a broad segment of it, providing great ease of use without "dumbing down" its capabilities for more advanced users.