I hate to mention DotA, but isn't it patched practically every 2weeks? Because it needs to be, it has so many balance aspects that need tweaking frequently.
I doubt Demigod will be perfectly blaanced at release. I'd hope for a similar patching every 2 weeks for the frist months at leasst. Players are going to find broken things in balance that the testers probably didn't realise in Beta, or that simply weren't fixed in beta, or considered a problem in beta..
Well, for Dota, they are continuously adding new content (items, heroes, features) based on community feedback and ideas. Everytime they add a new hero (latest super hero being clockwerk), everything needs some balancing out. As a result the constant flux of new maps is both a community/development desire, but also needed.
Now lets look at Starcraft. No new content for 9 years. However, they are still doing patches for the program. Why? new/old exploits, new cpu technology (no need for CD anymore), and yes, the occasional bug that pops up. In other words, the attention given to patches has been great even now, 10 years since the release.
I've been very impressed with the developers response to the community thus far on these forums. I'll hope with pink that the trend will continue and the patches will roll out far after the initial release.