Yeah, I'd say the single biggest flaw in the Civ III catalogue of irritants would be the failure of the SGL "Improve general science output" option. It's infuriatingly "Why, why, why, why, why couldn't someone have sorted this pre-release".
Take my current game, for example. I have one of those cities that's a Wetlands+River+Corn+rolling Hills and is currently producing 100 corruption-free shields per turn. I'm knocking out Industrial Age Wonders in 8 or 9 turns (depending on Pollution). I have this SGL, but I'm not 'wasting' it on an 8 turn structure.
However, during this time I was conquering the other half of my continent and had reams of Elite Cavalry but no MGL and my economy is a bit slowed due to Unit-production and War Weariness, about 8 turns per Tech.
I'm wanting to keep the SGL for the biggies in the Modern Age, just to feel I get some worth from it, when, what would be really useful is either Military Leaders or a couple of turns less per Tech.
The combo of the Science glitch plus the MGL barrier is really head-bangingly eye-rolling.