Because they are boring imo. Its all fundamentals. Im not asking every team to be a PRX or a Geng, but some things like big brain FNS style outplay or Alfajer doing alfajer things and taking over a round is good enough. G2 don't even do those. They are as boring as those mid boring emea team (think Giants last year) but are much better.
Props to them though, G2 don't have a Zekken or an Aspas so they are playing to their strengths to beat teams with those players. Its clearly working.