I agree completely with Avin, and thus I will try not to write a novel. I played Cross, expecting to get the same sort of feeling I got from Trigger (which I played waaaaay back when it first came out in '95). Trigger felt like a windswept adventure to me--I was always wondering where that next Gate would send me. I was excited when Marl was first pulled in at the Fair and I got to follow. I was sad when I saw what would become of their world--I was determined when the time finally came to storm the Ocean Palace to save Schala. On top of that, all of the characters brought something special to the plot, and spoke volumes about the world they came from. And you didn't need a million of them to be interesting.
Cross's major flaw, as has been mentioned millions of times above, is the overabundance of PCs, and the lack of meaningful PCs. It's OK to have 100 playable characters as long as you at least have four or five that will drive the story strongly. And of the "main characters" of Cross, Kid is off your party for half the game, Harle is incredibly mysterious (though in my opinion, she was probably your most compelling PC), and Serge, of course, is the silent protaganist; though it would have done loads for Cross if Square had sort of dropped that tradition, as at least you would have had his insight on the world, and what was happening to him.
Also, I played Cross almost DIRECTLY after Xenogears, and I believe someone else mentioned that here--the battle system was a bit too similar for my tastes. XD And somehow, it was far more fun in Xenogears... And of course, Elements were a lot like Materia, so it didn't really matter WHAT your innate was, as you could give everyone anything. Sure, customization is good, but then when you have the weak bodied healer characters, what point is there to use them?
But Cross had its good points. Though I hated El Nido as a whole (mostly because it barred me from leaving to Zenan, which is what I wanted to do the entire game), there were parts of it I liked. Water Dragon Island, that forest that you go to on your way to Viper Manor, the entire Dead Sea sequence (I shed a tear when they did the Nadia bell thing, and I realized what had happened in Guardia)... But there were also a bunch that were sort of "meh". And replacing vast time periods with 3 or 4 screen long islands just wasn't cool. Granted, I liked the dimension thing at first, but it sort of lost its coolness once I realized that was all there was. o__O
OK, well, that's it.
My theory is that like with the Final Fantasy arguments (VII versus VIII in particular), it seems that people prefer whichever game they played first. For a Cross gamer, Trigger will not have the same sort of dramatic feel to it, as it was more of a lighthearted adventure. For a Trigger gamer, Cross lost that whimsical feel.
That's it. XD Loved the soundtrack, tho.