I don't think internet makes it easier or more difficult to get good deals. I think the whole set of principles behind coin shopping has shifted, so I vote for 'different', which isn't listed of course.
Anyway, the biggest disadvantage is not being able to hold the specific coin in hand before you buy it. Anyone can post a stock photo of a coin online. Is it really the coin you get? Not everyone is a Steve McCurry when it comes to photography skills. Using too much flash under the wrong angle and your coin looks harshly cleaned. A lot of blame will be put on that in case of disappointments. Is everyone honest when it comes to descriptions? Coin grading and pricing is highly subjective. What does 'choice' mean, which 'details' are subject? Or why is it even sold as a problem free coin? And how good is the deal when postage is added?
Now for the bright side for the buyer. The amount of offers is dozens of times bigger than it used to be. Not everyone is a highly specialized coin seller, not everyone cares about what's being sold: some people just want to get fast cash out of a heritage and got advised to auction or sell online. And added to that, you now have the world as your playground. Coins are valued in a different way in different regions. Here in Europe American coins are not cheap, but less overpriced as they are in the USA. Norwegian or Dutch coins, on the other hand, seriously drop in value when spotted outside Norway or The Netherlands.
I do see that coin shops also tend to react to what's happening on the net, by either opening up their own shop or by adjusting prices to what's happening there. You now have a price reference on your cell phone and you don't need to buy a
Red Book or grey sheet anymore to get an indication of what catalogue prices may look like, and they know that, too... That also means that they will push up the price of some foreign or obscure stuff, by the way, as they need to make money out of that now as well.
So, different, not easier or harder.