I believe anything you say on coins is fair game. Criticize the coin, not the person is their motto. However, as you do tend to talk/write in a unique prose it may pay to get to the point directly and keep it short-and-sweet, post-wise. Not everybody appreciates your writing style like Yours Truly.
I belong to 2 sites, this one and CT. I don't post at CU/PCGS.....some interesting threads, but I get the feeling newbies and posts/threads asking questions are not as welcome. Also, don't see as much interest/posts on the coins I have interest in. I scan them over there....a classic thread on (Franklin) Gradeflation and one on the 1933 Saints that had Roy Langbord enter, but not that many others that would cause me to sign up.
I find the NGC Forum great for stuff on Saint-Gaudens Double Eagles, as you can tell from the 34-pages-and-counting thread, thanks largely to all the posters including author RWB. The Newbie section here seems to have gotten very active (or maybe it always was, and I never noticed) and the US/World/Ancient section has some great threads, too, besides the SG DE thread.
Dena seems very helpful and Dave Lange has some great posts and informative threads he started. The counterfeit articles/threads posted by NGC Mods are also great.
I was away a while after the big layout switch (I couldn't find anything !) but now find it pretty easy to navigate. Still think the Search Function could be better....not sure how far back threads/posts go here but would like to be able to bring up any thread title with "Saint Gaudens" or either word...and see all the threads going back 10 or more years on 1 or 2 or 3 pages, tops.