bitcoin being attacked??
nope

services that use coin being attacked?
yes

mean while in the land of fiat
http://edition.cnn.com/2013/03/20/world/asia/south-korea-computer-outage
http://www.itproportal.com/2010/10/25/how-bank-hackers-beat-barclays/
http://www.huffingtonpost.ca/2013/03/21/td-hacked-bank-online-attack_n_2924897.html
http://www.nbcnews.com/technology/technolog/u-s-bank-website-hackers-used-advanced-botnets-diverse-tools-6238850
that was just a 10 second google search.. not to mention all the armed robbery's and such that banks have had over the centuries..

so should bitcoin worry?
no

so should services that use bitcoin worry?
yes

services especially exchanges should learn from these DDOS's and hacks to ramp up security and system infrustructure to reduce the risk.