^ i second that!
they are yuck
I remind myself and others that it is not from adab of the sunnah to criticise any particular foods. The messenger, sal-Allaahu `alayhi wasallam would eat a food if he desired it, and leave it if he didn't have an appetite for it. Foods (and the various types) are a blessing from Allaah, we should appreciate them and not criticise with statements like, "Marmite is disgusting!". I will try to bring the proof inshaa' Allaah, unless someone gets to it before me.
Jazaakumullaah khayran.