There is no such thing as a "Bad character" there is no truths or fact to this statement, that is your own opinion.
Too some this could have been there most antipated fighter. You pulled out your broad brush and painted it like this is a horrible thing.
Plus, Xenoblade is a HUGEEEE deal in Japan and this was catered to them, which is ok . Knowing the way this has turned out before (Hero feeding Japan, and us being given Banjo.) The next character will likely be a more U.S. based Character. People wanna get so upset about a character in a video game because it could have been a better pick or there was a better option, there will always be a better option no matter who it is and who your gonna talk to.
Just have fun dude, this isn't something worth crying/sharing your distaste about.
I'd also like to say that Xenoblade, is getting more and more love over the course since Xenoblade Chronicles 2 and Torna was success stories for the Switch. It, alongside Splatoon, is gaining higher in the popularity ranks; getting close to FE level. This feels more like a JP/Sakurai choice, but it's not an unwarranted choice.
Rex did miss out of the slots for Season one, after-all.