Fantasmic IS great and is a must see....but ONLY the version being shown at Disneyland in sunny California.
The version of Fantasmic being shown at Walt Disney World is indeed a one-and-done experience, i agree.
The two versions of the Show are stark contrasts, with DLs version totally blowing away WDWs version hands down.
If you have not seen DLs version, i highly recommend it IN PERSON , as video does NOT do the Show effects or giant full-bodied Maleficent dragon justice at all.
DCA*s World of Color gets rave reviews, and i also recommend seeing it in person.
Again, video does not in any way capture the true sense of scope or the intense color hues used during the Show.
Although i personally am not a huge fan of Shows based on a heavy reliance on video projections, the interesting effects done with lights and water are indeed neat to see in person.
The full effect is felt when you view right next to the waters edge...or where you can clearly see the full lagoons surface.
There you go...two good excuses to visit Disneyland !