Your frustration and loss of love for your bike is very understandable.
It strikes a chord with me as I look back to 1994 when I went from having many years of Jap bikes to going Italian via Moto Guzzi (1100 Sport) for very emotive reasons at that time, then gradually feeling let down by the niggling and pretty continual technical issues.
As it turned out, I never ended up falling out of love with Moto Guzzi. I still love them, warts and all. I think I was 'saved' by having the knowledge and support from other Guzzi enthusiasts through the UK owners club. I got over the hump (or trough??) of dissolutionment and over time I discovered that they were actually very robust and reliable machines once the niggles were driven out of them by savvy and knowhow.
I trust that the 2.5 Rocket 3 is a similar kind of situation.....Too early days for me to say that with any long term experience, but then again, it could be that i'm still in a honeymoon period with my bike and the rose tinted spectacles are still on.
I do have ongoing problems with mine, but unlike your brake problem, my niggles and frustrations haven't prevented me from riding mine safely and enthusiastically.
I hope your bike gets fixed at your next dealer fix.