Is the London System opening is a good opening to invest on for getting deep on its variation for a beginner player (rank 1000-1100)? actually I heard it's a boring and systemical opening and for example GM Hikaru doesn't like this opening (I see his reactions on his stream when someone plays it), although I saw some amazing game that Magnus Carlsen played with London System.
Any system (almost) can be good/bad for you/your_opponent depending on many factors.
You should pick one opening you like that fits your personality/style of play. And then master that opening. Be prepared to change as you improve though as what worked against beginners may not be as good against masters and GMs