These actors may have actual enthusiasm for what they're talking about but the directors are probably in their ears yelling "Step it up!." It's like watching ridiculously intense anime where the emotions are completely out of touch with reality (not knocking anime some of it is truly amazing).
Their enthusiasm may be real and they may be hired to sell something but you can always sniff when that enthusiasm is tempered with bad direction. Plus it doesn't help when they're selling a turd.
I'm going to guess that a Producer (or a team of producers) directed this, hence the bad direction.