Language is not "just a language", different languages have their own characteristics and sounds that clearly also flow differently in music, changing one language to the other changes the dynamics. Language is identity, culture and it's a whole scientific doctrine (ask any linguist out there) and yeah, why Eurovision fans out of all people want to only hear English is beyond me...
with that said... a bad song probably won't get much better regardless of language, and musical taste is subjective, but to deny that different languages add different characteristics and to even promote the idea that all should be in English is just odd in this context and kind of contrary to the idea of the contest.
Not sure how something can be regarded as "spiced up" when it's a lingua franca used in the vast majority of entries and is the standard language of most international songs out there
... I think Portugal (and in this case Georgia) are rather "spicing it up" by going against the norm.