Yep. I'm all for people buying and collecting whatever they like, but people simply don't think these things through.
A major strength of gold is as a compact and dense store of major value. I wouldn't go below 1oz gold coins or bars... and if you can't afford that, you should be buying silver or saving more. The blister-packed gram gold pieces completely defeat the purpose of being able to store and hide and transport gold's value compactly and easily. The fractionals are also much less liquid at coin shows and coins stores, ebay, etc than the 1oz coins.
...it depends how you define it, but I concur that SHTF just won't happen. In a short term situation disaster situation (usually weather related) where the power or roads are compromised for a few days or so, you should have stocked non-perishable foods, candles, cutting tools, water + bottles, emergency radio, and useful stuff. The key is weathering the storm. Gold certainly doesn't help you there.
A long term or worldwide SHTF just won't happen. Even if a civil unrest or disaster did take awhile to clean up locally (ie Argentina economy or Haiti hurricane), stopping to barter and interact with random hungry and scared people would be one of the dumbest things you could ever do; you'd likely end up robbed or worse. In those situations, you'd be best served to keep to yourself, have a very low profile, and simply flee to a more stable neighboring region or state or country when possible, so you'd would want compact and transportable metals in that case. The fractionals would be more a burden to transport than larger pieces and tougher to sell once you got out of the disaster zone.
.If you want fractionals, silver fits the bill pretty well. I wouldn't consider them for barter, though... consider them for profit. And yeah, stick with half and quarter oz ones... the 1/10 and gram ones are just too small in size/weight and in value. In hot silver markets, premiums on everything go up. That is the only argument I could see for wanting fractionals. Assuming you bought in a low/medium market, then you will make money selling 1oz coins on ebay in a hot market, but you make significantly more for each four 1/4 oz coins you sell.