I don't care for the Omanyte line at all, really. It doesn't help that Omastar is extremely overrated. I like Kabutops just fine, although I don't like Kabuto that much. Aerodactyl is awesome. I don't particularly care for the Lileep line. I like the Anorith line more than the Lileep line, but I don't like them that much. The Cranidos line is awesome. The Shieldon line is also awesome. The Tirtouga line is nice, but not amazing. The Archen line is awesome.
Overall? I like Aerodactyl, the Gen 4 fossils, and Archen/Archeops the most.