Screwed by the Network: More than any Digimon series before it. Perhaps due to changing channels from Fuji TV to TV Asahi, Xros Wars was beaten around repeatedly. Episodes were frequently delayed before the show was suddenly moved from a primetime slot to Sunday morning slot once again, resulting in an entire month without any new episodes. Only time will tell if the show will fair better as a result of this.
While the ratings have been lower than usual (which may be in part due to the aformentioned episode delays, switching channels, and moving the time slot), its toy sales are pretty much better than the last two shows, so much show that Riku Sanjo hinted of the possibility of extending the program when needed.
The dub was screwed hard by Nickelodeon. Two episodes get shown, then the next one is pre-empted for Worldwide Day of Play. The following week, despite episode 3 being scheduled, episode 1 gets rerun instead. And now it's off the schedule for SpongeBob SquarePants reruns! Talk about taking Screwed by the NetworkUp to Eleven! Luckily it's supposed to also air on Vortexx at some point.
Same with Tactimon. He had a hidden technique that is, according to his profile, capable of splitting a star in half called Hoshiwari. He never used it (possibly because it was deemed too dangerous to be used at all and Bagramon forbid him to ever use it or something like that).
Related to that, he never got to draw his legendarily powerful sword on screen. We had to settle with it appearing in the manga.
Digimon Fusion Battles seems to be the official English title in Malaysian markets at least, based off of this Disney XD Malaysia trailer that utilizes an alternate English dub of the series. Is also the official Italian name.