For what it is worth, I'd like to state my support for negative events.
It's not a playstyle I've seen discussed much around here, but when I play, I try to play with a simulationist style. I always pick a random leader, and make my decisions based on how I think that leader might react to the situations he or she is faced with, making up a story in my head as I go along of the country's history. I don't think very far ahead for tech choices, trying to pick techs that would be desired at the moment, not beelining. I also ignore the Great Person progress meters, as I prefer thinking of the birth of true geniuses and visionaries as unpredictable events, and welcome surprises. (I do use InfoAddict, which I integrate into my games as the results of espionage, in the absence of any existing spy mechanic.)
What I'm trying to convey here is that there exist some (few?) people that prefer a more simulational, non-optimal approach to the game. Excluding negative random events hurts CiV's simulationist aspects, as while these sort of things are frustrating, they add realism to the game. Off the top of my head, I can recall events like the Kamikaze, a storm which destroyed an attempted Mongolian invasion of Japan, or more commonly, the Russian winter hampering and/or destroying invading armies. Pompeii was destroyed by a volcano, and the Black Death is perhaps the most well known and devastating plague in history.
Maybe you could put a toggle or something on the options menu at the game set up screen, so those people, of which I am sure I am not the only one, can play with negative events, while the rest of you can ignore them?
It's not a playstyle I've seen discussed much around here, but when I play, I try to play with a simulationist style. I always pick a random leader, and make my decisions based on how I think that leader might react to the situations he or she is faced with, making up a story in my head as I go along of the country's history. I don't think very far ahead for tech choices, trying to pick techs that would be desired at the moment, not beelining. I also ignore the Great Person progress meters, as I prefer thinking of the birth of true geniuses and visionaries as unpredictable events, and welcome surprises. (I do use InfoAddict, which I integrate into my games as the results of espionage, in the absence of any existing spy mechanic.)
What I'm trying to convey here is that there exist some (few?) people that prefer a more simulational, non-optimal approach to the game. Excluding negative random events hurts CiV's simulationist aspects, as while these sort of things are frustrating, they add realism to the game. Off the top of my head, I can recall events like the Kamikaze, a storm which destroyed an attempted Mongolian invasion of Japan, or more commonly, the Russian winter hampering and/or destroying invading armies. Pompeii was destroyed by a volcano, and the Black Death is perhaps the most well known and devastating plague in history.
Maybe you could put a toggle or something on the options menu at the game set up screen, so those people, of which I am sure I am not the only one, can play with negative events, while the rest of you can ignore them?
)
I think negative events would help in keeping check on world powers to keep things interesting. Right now once u get at top of the score & have a strong enough military, contiuing is pointless due to complete absence of negatives in ciV. Only happiness is used to limit expansion & power which makes it boring due to lack of any other limiting factors. 
Happiness options in Opportunities should be bumped up from +2 to +3 if not more (or -20%:c5angry in this city, etc). I don't think I've ever picked
Production or
Science.
amounts (especially when the tradeoff is -
in larger cities,
with more expensive Social Policies,
)
Well, perhaps there's a way to adapt them to things we can do! I'm focused on bugfixes and fine tuning the public release at the moment, but I'll come back to this later today or tomorrow to provide more detailed feedback.