I was late to the game with Marshall, but I love them now.
My first experience with a Marshall was really bad! When I was young and didn’t know better I had to play a show with an early ‘70s 100w Plexi half stack someone else had provided.
I had no idea how to use that amp and I had to use it with the volume set really low and clean. It must have had a crazy bright cap value, all I remember was it was brutally harsh - shrill, clangy… just the worst sound I’d ever heard.
That turned me off Marshall for a long time. It took a while for me to learn how to use them, but once I did it was a huge epiphany!