Having said that I personally know a couple people who were stationed in Iraq in the Army. They hate the Beretta M9. Said it doesn't do well at all in sandy environments. Frequent jams, failure to return to battery, etc.
I've personally never had a problem with mine - but I've never used them under adverse conditions like they have. I have no reason to doubt the experiences of those I know though. Those guys were praying for something else..
I wasn't going to way in, but I'll respond to this one. I carried mine for a tour in Afghanistan, my wife carried hers in Iraq and the Philippines. Before I went over in 2003 and again before her tours in 2005 and 2007, I did some research and discovered that the vast majority of the complaints about the M9 were traced back to the magazines. The DoD bought additional mags on a low-bid, outsourced contract that ended up going to an Indonesian company (they make a liscensed version of the 92FS). The company sprayed the magazine bodies (inside and outside) with a rust resistant coating. That coating started flaking off and jamming the follower and slide. I made sure that both of us had OEM mags on our deployments.
My last year in the service I spent training Soldiers with little handgun experience on the M9. Yes, the slide mounted safety is a pain in the neck, but with practice and awareness it's not an issue. Every one of those Soldiers took my advice and throughly inspected their magazines. The Army had replaced most of their magazines removing the problem ones from the supply chain.
As for operating in adverse conditions, the 92 (or the original 1952) is/was the standard issue weapon for the Isrealis, the Saudis, the Jordanians, the Iraqi (pre-invasion), the Turks, the Kuwaitis, the Omanians, etc... Just a thought.
Also the US DoD made an additional purchase of M9s back in September.
Is the grip thick? Yes it is. Almost too thick for me, but my wife loves it. She shoots it better than any other gun she's tried (she hates Glocks so...).
Also, its the gun that is always loaded and ready to go in the safe. It's the first gun that either of us would grab if the SHTF. I should probably get another one so we aren't fighting over that one.

Aloha