Foxit is fine for home assuming you remember to correctly untick all the adware options. But in a work environment (I work at a printers) on average i'd say Foxit incorrectly renders PDFs about 5% of the time, leading to support calls whereas Adobe Readers incorrect rendering is pretty non-existent. (I actually tried switching work over to Foxit a while ago, nothing but support hassle from incorrectly rendered PDFs)
I'm not defending Adobe here because I think their reader is a bloated pos, but if you're going to recommend a third party PDF viewer then Sumatra is the best, it's light weight, loads damn near instantly and doesn't include a JS engine side stepping a lot of security issues.
Also, on the major attacks/flaws thing. Actually Foxit has had some seriously bad security issues, you need only google for "foxit reader security holes" or look on explot-db
to see them.