I find that FOOK2 really just ruined the experience of FO3 for me. DOn't get me wrong, its a great mod. But I dislike the "reality" aspect of it. I love real world weapons. But I find that they detract from the FO universe. As far as other aspects of FOOK2 like the ability to "breach" a lock with explosives I find that fun as hell.
Since installing FOOK2 on my game about 3 weeks ago I can honestly say I've played twice. I think this Christmas break I'll be uninstalling FOOK2.
Has anyone else had any similar experiences with any MODS, not necessarily with FOOK2 but with just any type of mod.