The 30msec is several hops out from them, which implies their ISP is fine, at least to a certain point. @Furious - ping test/traceroute a few other sites, specifically ones within your country, that will give a better view, if they all hit that 30msec hop, then your ISP may just have a lousy route to the internet backbone, or some other routing problem on their network.
Those 4 first hops seem to be from the same company - OTE in Greece. How a home connection reaches the backbone and cloud providers has everything to do with the ISP and not a single home router can help here. Maybe other ISPs have the same issue in that location, but it's worth a look...
My neighbour pings Google under 10 ms, while I get 15-30 ms. The more my packets travel, the bigger the latency gap between us....and obviously, we do not share the same ISP.
OTE - Wikipedia
en.wikipedia.org
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