I actually don't mind Balfe or Tyler as composers, but their recent action scores have tended toward generic and underwhelming (Balfe with Geostorm, 12 Strong, Terminator; Tyler with The Mummy, Fast & Furious, xXx).
Hans Zimmer's score for M:I-2 is fantastic, and was one of the scores that made an impression on me when I was growing up and got me to appreciate film soundtracks as music in its own right. The other scores for the franchise (before Rogue Nation) suited the films fine but never impressed me.
The problem I have with Balfe or Tyler scoring Fallout is not that they're bad composers (I greatly enjoy Balfe's work on Beyond: Two Souls, Blackwood & Ghost in the Shell, and Tyler's work on Children of Dune, Bangkok Dangerous & Now You See Me).
The issue is that they seem to be scoring everything these days, and most of it is unremarkable. How many projects can you work on in a row and still keep up your level of enthusiasm and creativity? I don't want another heavy on the bass and synth, simplistic RCP-sounding score. Kraemer brought something special to Rogue Nation (which actually took me a few listens to get into, so I don't blame casual viewers for not noticing it), and I'm disappointed that he won't get the chance to expand on his ideas and themes for Fallout.