Ugh, yes, Thor has more chemistry with the table he overturns after his failed coronation than with Jane. There is that.
I think it's indeed the forced and badly written romance aspect that annoys me about it all, but as mentioned, it's not Jane's fault.

I recall the anime days when many (young) girls drooled over anime boys and hated female love interests on principle. Maybe it's part of growing up, or going through a certain age when you experience sexual/romantic awakening by crushing on fictional characters (granted, though, not everyone has that of course). But that stage should be left behind with age, in my opinion.