http://www.exatogames.com/Guncraft/

For those of you who have backed or at least followed its Kickstarter, you'll know it's a mix between Call of Dooty and Minecraft. It's pretty good actually. Despite the influence of the former in terms of setting, it's fun. You can destroy everything, and there are vehicles too.

They're in open beta, so everyone is welcome to play. See if it's your cup of tea.