Well, look at it this way. If we were doing a peaceful builder gauntlet (Space Race, Cultural, Diplomatic) and I saw Alexander was in the game, I would immediately restart.
Alexander attacks based on weakness, nothing else. In a builder game, to maximize your time you build a minimum of troops. This means that you will get invaded unless you build a military.. and if you spend time building a military, you're going to be behind the guy who isn't.
Besides, there are ripple effects. Once aggressive civs enter a game that is ideally peaceful, the AI starts taking sides and you start accruing negative modifiers for having agreements with [somebody's] worst enemy. It quickly spirals out of control and you find yourself in war.. and behind. It just doesn't work.
In violent games (Domination, Conquest), I'm all for Random civs... but then, it doesn't matter. All civs are more or less equally bad at fighting. A human player rolls over them with ease.
I'd be fine with the gauntlet rules dictating your opponants, which is something I think will become very important once we have to start cycling back through the victory conditions, but I think requiring Random opponents is just adding another factor into the Regenerate/Restart grind, making the perfect, lucky start all the more valuable.
Heh. How about an "Always War" space race victory? That'd be fun.
- Bill