Sorry to derail (or rerail?) the thread but:
I'm not sure I get the original poster's point at all. You're allowed to criticize and make suggestions, yes, but perhaps you should consider where you do it? And why wouldn't people be allowed to disagree with you and tell you why? Is your opinion more valuable than the opinion of others, just because you've played Civ from the first instalment? Are those people not allowed to share their opinion?
Don't get me wrong, I'm not going to say Civ5 is perfect since I don't even have my copy yet (one... more... day...), and I have no clue what transpired in your 'Earth map' suggestion thread, but I do feel the need to point out that you're posting on a fan-ran public forum, not your own domain. You're bound to the rules of the place and are going to have to accept you're not above them. If you feel you're not doing anything wrong yet others are crossing the line, go ahead and report it - I'm sure there'll be moderators around to keep flamers and trolls in check.
Secondly, I have to disagree with your Starcraft 2 statement. Living up to the hype? Not really, if you see all the complaining and whining about it. Balance issues, disappointing campaign, lack of options, over simplified controls, etc. etc. - at least if you believe things everyone spouts. And those people are often told they're whining and should stick to Starcraft 1, for example. It's doesn't differ much from Civ5 so far; a lot of people will be happy, a lot of them won't be. I myself, from playing the demo, and quite excited by the direction Civ5 is heading and will be looking for way to help to improve the game by being constructive in my criticism instead of just ranting away when I come across something I don't like.
So in conclusion, yes, you're allowed to have an option and share it with the world. Just keep in mind how you and where you do that. And then be warned that people will disagree with your opinion and will tell you all about it. It's how the internet works.