1. Civ V has problems
2. The Civ series has possibly the most loyal and passionate fan base of any computer game ever
3. Because so many people love the series so much, many people get worked up when something seriously disappoints (with most other games, a disappointment would result in

"meh" ). The opposite of love is not anger, it is indifference.
4. All true fans will react. Some with politeness, some not so much. Personally, I am deeply grateful for the literally
countless hours of enjoyment the series has given me over 20 years for a relatively tiny investment. For that reason, I am inclined to express my feelings of moderate disappointment with a restraint and courtesy seasoned by gratitude (yes I know they are in business, but they could have invested their capital in making ball bearings or deodorants).
5. Also, I am grateful that other people generally don't greet my numerous well-intended screw-ups with blistering scorn.
6. I'll continue playing Civ V until Civ VI arrives (sooner rather than later, I hope).