What makes an airsoft gun a good airsoft gun?

You want a gun that can shoot over 300 fps for sure. fps means feet per second that the bb is traveling when you shoot it. Also you want one that is well built, usually really cheap ones will break, and i mean price wise cheap. A good one for a beginner may be a Night Prowler SA, from Crosman. Im selling mine right now cause i don't have anyone to air soft with anymore. But you have to understand that you may have to spend 100 dollars, most likely even more to get a good one that you'll have for a while. But, depending on what your doing, like if your the dude who runs at the other guys shooting then you want an electric gun. If you like shooting from a distance than you might want a springer. Or you just want the Night Prowler SA, its full auto or Semi auto and can shoot really far really fast. Its an awesome gun, you should look into buying mine, or another one. Whatever

so many choices! well for my first airsoft gun i chose an AEG (an electric airsoft gun) if you're just starting i wouldn't spend TOO much on your first gun. maby under 50$. my first gun was the both elephant m8. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=190271500416&ssPageName=MERC_VIC_RCRX_Pr4_PcY_BIN_Stores_IT&refitem=190270790628&itemcount=4&refwidgetloc=closed_view_item&usedrule1=CrossSell_LogicX&refwidgettype=cross_promot_widget&_trksid=p284.m183&_trkparms=algo%3DCRX%26its%3DS%252BI%252BSS%26itu%3DISS%252BUCI%252BSI%26otn%3D4 theres the link to it and its only 35$ high fps, rate of fire, and the structure of the gun make a good airsoft gun. the gun i showed you has 300fps and its rate of fire is pretty good. i've had it for almost 1 year now and i havent had any problems with it. i still use it as a backup in airsoft games