It's never too late to enjoy the Dreamcast, and even though some of the games have been ported to other consoles there are still many good ones that are exclusive, or their best on the Dreamcast.
Rayman 2-best on the DC
Red Dog-Exclusive
Max Steel- Exclusive
Metropolis Street Racer-Exclusive
4 Wheel Thunder-Exclusive
Legacy of Kain Soul Reaver-Best on DC
Starlancer-Exclusive and still online
Deep Fighter-Exclusive
Powerstone 1&2-on PSP, but not as good
Heavy Metal Geomatrix-Exclusive
Super Magnetic Neo-Exclusive
Toy Commander-Exclusive
There are many more exclusives, and most of the ports were still better on the Dreamcast, Grandia II and DOA-2 are but two examples. Skies on GCN was very good as it had the DLC included, plus a bit more content. Unfortunately the music was downgraded, 480p taken out and Pinta's quest was removed.
New games are still being released, Fast Striker on Dec,28/10, three the year before, and it looks like we may get at least two this year, maybe as many as four.
I was a huge Nintendo fan(still am)when I bought a Dreamcast, it blew me away. SEGA poured their heart and soul into it by releasing over 150 first party titles, too bad many did not make it out of Japan. All of the many fighters and shooters released only in Japan are import friendly, as language issues are not a problem. The Gameshark Lite is cheap on ebay(works great for imports), enjoy your Dreamcast, many of us still do.
Dreamcast-18 years later "It's Still Thinking"
