I see lots of emotion there -- and I have my own [emotional] OPINION -- which is: though Miranda is the sexiest of the series (only outdone by EDI), Miranda speaks from the intellect in contrast to Liara who speaks (to me) from the heart. Whether she's right or wrong is not the issue. We've been right & wrong at times in our lives (though some think they are NEVER wrong -- though I can think of a specific 16-year-old that has the whole universe figured out & has concluded everyone is an idiot but him).
Personal preferences and all that, but I personally love Liara precisely because she speaks from hearth
Not to say I don't love Miri as well, mind you. She's a great character and sexy as hell too.
And seriously, you're telling me there are sixteen year old who aren't like that? 
From what I read she apparently talks about wanting to have sex with Javik at the DLC party Shepard can host, or someone mentions it and she gets nervous/blushy, even if she's with Shepard. I didn't romance her though so again I might be wrong.
Actually, it's Javik who lets it be known that maybe he doesn't hate Liara as much as he makes it appear during the regular game. As well as Garrus, Grunt, Kaidan... There need to be certain prerequisites met for that to happen, but yeah, you kinda have it backwards.
Everybody wants Liara, you know 
Whether Liara was popular or not, it wouldn't justify whatever special treatment she may have received. Soldier was the most popular class, but it didn't get any more attention than the other classes. ManShep was more popular than FemShep but both got equal treatment. Etc.
That is not totally true, depending on how you view it. Like you mentioned, soldier was the most popular class and it shows in the game, where Shepard has Avenger/Predator equipped in pretty much every cutscene. Why does my adept use Avenger, when she never picked it up before? Why can't my engineer be shown blasting the cannibal with the incinerate? Soldier did get preferential treatment, in it's own way, though how much of that was because of laziness/time constraints is anybodies guess.
As for FemShep/MShep... I give you evidence number one that you're not right. Then there is the fact that FemShep uses pretty much all the same animation as MShep, which makes her look... pretty damn odd at times. Once again, how much of that was laziness/time constraint and how much was favoritism is anybodies guess, but FemShep actually got pretty screwed in that department.