yeah, last couple of weeks have been weird. many invalid, lots of unconfirmed for prolonged times, miners getting disconnected, now "stingy" blocks. no updates on slush page or FB site. site has way too much hashing power to only have 3 blocks in 2 days.
What I'd like to see as another luck definition is the daily percentage of the network hashing power that the pools have versus the percentage of coins mined by each pool, which might give us an idea of any possible problems.
A rough calculation I have just done:
Network hash rate per
http://bitcoincharts.com/charts/mtgoxUSD#rg90ztgSza1gSMAzm1g10za2gEMAzm2g25zv is about 15,300 TH
Slush pool is about 725 TH
Slush % is about 4.75%
Blocks released per hour is about 7, so per day = 168
4.75% of 168 is about 8 - I don't think that luck comes into the current situation, I think something is awry.