Diversity for the benefit of straight dudes...color me enthused.
Sorry, but 1 straight, 2 bisexual female companions is never going to be better than DA2 from my perspective.
It's not the diversity that makes it better than DA2 (There is presumably also a straight male LI in this setup), it's the fact that there are simply more romance options available. before everyone got two options, now everyone gets at least two options and some people get three.
There's no less diversity than in DA2 (although probably not more, because the above aforementioned straight male LI and likely other straight companions), so objectively it's better.
Obviously one gay one bisexual one straight would be superior because then there would be a homosexual female companion finally, but the uneven number of options doesn't bother me as long as no one ends up with less options than before, which they won't. All of this is assuming quality remains unchanged, of course.