Bugs are always bad (and security bugs even more so) - but I've always felt that Flash gets a disproportional amount of hate/hype in the media. To some degree it should be normal that the more widespread a technology is - the more it gets targeted for security exploits. If you run the popular browsers/plugins against the National Vulnerability Database, you'd get the following results (as of January 2014): - Internet…
That's misusing statistics, you can't determine how secure something is by just summing up the number of vulnerabilities - equally weighing/comparing browsers with a plugin etc.
By the way, Apple's opinion on Flash in 2010:
Third, there’s reliability, security and performance. Symantec recently highlighted Flash for having one of the worst security records in 2009. We also know first hand that Flash is the number one reason Macs crash. We have been working with Adobe to fix these problems, but they have persisted for several years now. We don’t want to reduce the reliability and security of our iPhones, iPods and iPads by adding Flash.