I actually dont think he's a bad choice.
Dude is only 2 years younger than Christian Bale
They're both English Actors
They both have experience playing different roles in big blockbusters
He's not a bad actor (even though it's not as if you need Shakespearean training to play in a Summer popcorn flick)
The world doesn't end if Orlando Bloom gets the job
Other than you saying he has experience playing different roles (most always a robe-garnishing historical epic), I think your critique is spot on, Chap... Kingdom of Heaven is one of my Top 5 GOAT movies.
My n*gga Liam didn't get a real chance to reconnect with his son before getting merked tho.