Of course, I am not a lawyer and what I write or say only reflects my opinion. And as much I like to discuss legal matters on a theoretical basis with business friends late at night sometimes, I really do not like the day to day implications of laws at all. That does not mean that I can ignore them.
Advertisements are evaluated from the perspective of a typical consumer.
Three important questions.
(a) Whose opinion is displayed? (average consumer, the advertiser, an expert in that field, ...)
(b) Are there reasons this opinion could have been influenced by the advertiser?
(c) What are the results a typical, average customer can expect?
(Very soon anything without a disclaimer will look suspicious. )
Situation In The European Union
Let's not forget, the Internet is more or less a medium without national borders.
I mean to say, it is likely that any website targeted to US consumers will effect some of the 500 million consumers in the European union as well.