I've watched all the games so far, and all of them were pretty fun to watch.
I thought that Greece match would be boring as Poland is not a high-profile team and Greece relies on defense never trying to set pace, but turned out quite entertaining. Even started to root for the Greeks since expulsion was too harsh and they should've gotten a penalty at the end of 1st half.
Czechs played openly but were outclassed by Russia. Except that Kerzhakov, he had half a dozen good shots from 10-15m from the goal, and it's not that he missed, but he missed by like 5-10m minimum, wasn't even close, as if he had vision problems or something. Sadly for Russians, the group is a walk in the park for them, but whomever they get in 1/4 finals will be very tough, that group is a killer.
Netherlands deserved at least a point, but that's football. Looking at the players, probably the best offense in Euro, it'd be sad if they wouldn't advance.
Germany was a little better and won by a little. Good match for the most part though.
Spain - Italy tomorrow should also be great, though Italy hasn't been impressive lately, a 0:3 blowout to Russia couple weeks ago, scandals over betting etc.