It takes two to save a marriage. If she doesn't want to work at it, he can't save it. She's looking for a reason and all these minor inadequacies are just the excuse. Maybe its a "starter marraige" as suggested by another poster. Maybe she woke up and realized, "Sh*t! WHat the hell did I do? Whya did I marry this guy?"
Maybe he was Mr. Right...or maybe he was Mr. Right Now... and now, she's found her real Mr. Right and is looking for a way out... and if she picks at all of his inadequacies, maybe she can convince herself, him and the world that its all his fault.
Maybe she's got a little action on the side and is trying to rationalize it by convincing herself that this guy is wrong for her, a bad husband, a failure, etc... just so that she doesn't feel all that guilty for boinking another guy... What he should do is pay attention to what she is doing for a while... see if there is something else going on... put some spy software on the computer to track her actions... watch the phone bills... see where she goes when he's at work, etc.
Maybe he comes back here posting to ask for advice for recovering from his wife's affair...
WOW! This is close to home!