Combat. For something written by people who have re-enacted hand to hand combat it runs fairly clunky and slow. When we run combat it feels like us as players playing a game rather than our characters in world fighting for their lives.
In contrast to that is combat in Warhammer FRP 2E. A percentile system with parries and dodges, it runs really quickly and the players feel the tension and fear of their characters.
Sometimes RuneQuest combat seems complicated just for complications sake.