JiffyPopTart
Bree-Yark
In some ways 4E would be higher, but it's simplicity of having things spelled out covered over a complexity of implementation. Lots of tracking of statuses, auras, conditions.
I had totally forgotten the not-joy of trying to remember the 5 conditions that lasted "until the end of this creatures next turn" that were always floating around during combat that kept getting overlooked. This was incredibly complex to keep straight. I now officially shift my 4e rating one step closer to More Complex swapping spots with BECMI.