They look "bigger" visually (even though Generations kicks ass visually, too). More on par with the other science fiction films released at the same time. The stories are more interesting. And yeah, the characters are more likable. Or at least I don't like the focus on Picard and Data in all four TNG movies. If I needed to choose between Generations, Nemesis and The Final Frontier, I'd pick TFF first, Generations second, and pass on Nemesis.