It got to the stage where I wouldn't have been surprised if I suddenly got a flirt option with Legion in ME3.
I love all the alien squad mates in ME, especially Garrus who will never be topped as a 'bro companion'. That said, I was actually a bit grossed out to find he could be physically romanced, considering he is for all intents and purposes a monster who would have no genetic compatibility with a human (even straight up stated in the codex how different their biology is). I think the worst part of it is that no one says anything about it, whereas in reality if it suddenly got revealed that an ultra famous celebrity was hooking up with a avian mandible boasting alien, you would never hear the end of it. This also works the other way round, as Turians would see Humans as looking a bit monstrous too.
He is an absolutely bad-ass character though, and I really would have supported (as others have said) a non-physical romance where the lack of physical attraction is discussed which would have made for an interesting and altogether unique and different experience from any other Bioware romance. Same can be said for Thane I suppose.
Tali I suppose in the end works as she essentially looks like a space elf who (from the limited images) would be deemed attractive by humans. That said, I think she would have remained much more of an interesting character if they had stuck more strongly with the 'she dies if she leaves her suit angle.
Romancing Asari for both sexes should obviously continue however as it is such a big part of their lore and background how they reproduce with other races and how attractive everyone always says the Asari are. The Liara romance also was my favourite of the ME series so I'm a bit biased.
Just my opinions, not really against them putting in more Turian/Drell/etc romances, I will just personally avoid them.