Was never really into McFly but was a massive Busted fan. I don't think I'll properly forgive Charlie for the band ending. I'd have been interested to see how their music changed over the years.
Ultimately Busted were a pop band and Charlie was really unhappy with how they were marketed and viewed (you can really seen this in America or Busted). I think had the band stayed together they could have slowly moved into more mature, rockier and grown up sound.
I think James is a talented songwriter and musician generally (I am pretty sure he can play a number of instruments) but his preferred music style is pop punk which has it's moments of popularity. Charlie clearly wanted to move to a more mature rockier sound which I think is probably better for longevity. I think Matt was just happy to be making music and touring the world with Busted.
I agree with some of the comments about James, he does seem immature for his age and he probably is a bit stuck at the age and time Busted ended. He has been successful behind the scenes but I think he likes attention and the spotlight (as a musician rather than as Emily Canham's boyfriend on YouTube).
Charlie had quite a bit of success with Fightstar and is still making his own music. I wonder if the whole getting Busted back together might have been him wanting funds to make his new record.
I think Matt's career since Busted has been interesting, solo album, working in the West End, I'm a Celeb, acting roles and a podcast. I always liked Matt's singing voice but it is much stronger since he has been on the West End.
In terms of relationships between the three in think Matt and James were pretty close in the early days of Busted and I think they have stayed in contact and remain good friends due to what they went through together (Busted was originally their band) but their lives are at very different places. I don't think James and Charlie are close, I think Charlie sees James as immature. I'm not sure about Charlie and Matt, their lives are probably more similar both having settled down with children and I can see Matt being supportive of Charlie's career like he is with James's.