Most of the graphical JS are not widely supported.
That's not true. Just look at the mootools site and you'll learn that they support every major browser (more then 99% of the browser market).
JS should always be used to enhance experience of the page,...
If the goal is to have a site with 'fancy moving sutff' then I think this can be considered 'enhancing the experience'.
One other think to consider: this is a gaming website. Most people that are going to be visiting the site are gamers. So you can expect an higher than average number of users with up-to-date webbrowsers than in the general public.
Also, most gamers are not security neat-freaks that purposely disable javascript.
Bottom line: 100% of our target audience's browsers will support javascript. So any argument about compatibility is void.