According to STATS (via Men's Health), in the 2011 Major League Baseball season at the All-Star break the number of runs per game was down 20 percent from 2000 and home runs had dropped 31%. It will be interesting to see these stats trend over the next few years, but assuming it does I guess this answers once and for all how big of a problem there was with steroids, huh? Interesting chart, with each # representing a MLB player (http://baseballsgreatesthitters.com/Steroids_and_HomeRuns.html)

Rank	40+ HR seasons	50+ HR seasons	60+ HR seasons	70+ HR seasons
The Dead Ball Era	0	1	0	0
Babe Ruth Era	18	4	1	0
Baseball During WWII	11	5	0	0
Baseball 1950's-mid 1960's	50	3	1	0
Pitching Era	27	2	0	0
The Last Clean Era	18	0	0	0
Steroid Era	83	11	4	2
Baseball After Steroids	52	7	0	0