IDK, I come into contact with alot of Ashley and Kaidan fans, and I see them complaining about what happened in ME2 as much as us Liara fans. I don't buy this sentiment that us Liara fans complain to a greater extent than any other fanbase. We may have a few more very vocal individuals, yes, but as a whole I don't see anything that suggests our fanbase complain any more than any others.
Plus, those of us that do have reservations about ME2 support our opinions with legitimate criticisms of the story, the characters, the direction of the plot, the writing, the romances. It's not as if every Liara fan has said "Aw what the fcuk no Liara in this game? -1 sale BioWare!", I've seen incredibly well thought out, articulate and in-depth criticisms of ME2 in this thread, some of them extremely enlightening and very much spot on. So saying Liara fans hate on ME2 because of Liara absence is a crass generalisation, and untrue in my opinion.
Anyway, like alot of others in this thread I don't mind the direction they've gone with Liara in ME2. Creating some strife for her, giving her this incredibly moving and powerful plight, having this emotionally dark chapter of her life be driven by her love for Shepard to me is quite interesting, and gives her character incredible strength, makes me sympathise with and love her even more and will ultimately make her stronger as a person, neglecting the fact that she was already a pretty strong person to begin with, IMO. Like others have touched upon, I think we are just seeing different facets of Liara's personality in ME2, or existing facets manifesting themselves in different ways. Contrary to what I think is an ignorant opinion of Liara, she isn't heading down a dark path at all. She's trust incredibly hurt and pained emotionally, and is suffering incredible guilt for what she had to do to Shepard, all just because she couldn't let her go and wanted to revive her. Her fear and pain over she forced herself to do is her chief motivation in all this, ie based around her love for Shepard. This flat out stated in the game, when Shepard calls her out on it: "That anger can't be just from what you told me. What else happened between you and the Shadow Broker?", to which Liara's floodgates then open and she opens her heart to Shepard. That's pretty powerful, IMO, and what she says when she does open up melts my heart and saddens me every single time. It's powerful, very powerful and also very moving too.
But, like others have said, it's just the execution I have a problem with. It's awful. Because of the lack of suitable dialogue choices in the Liara reunion, everything feels so incredibly forced and unnatural. Liara and Shepard never bring up their relationship with each other. This isn't a forced rocky second chapter at all, it's like something out of the freaking Twilight Zone. You have two lovers sitting here who obviously care deeply about each other, and they never even mention their past relationship? Just plain bizarre. Alot of Liara requires huge amounts of analysis and reading between the lines, hence my ignorant comment earlier about people who dismiss Liara's plight and her suffering, and that the manner in which Liara is acting and what she's forcing herself to do is nothing more than a facade. It requires incredible insight, and looking at Liara indepth, which is what is turning some away from Liara and that annoys me. As I said though, the direction they've taken Liara is fine, I don't mind it. The execution, however, is awful.
Also, regarding Shepard and Liara's romance, I think that those of us who allow it to survive this period, that allow Shepard and Liara to come out of this period of being apart with their relationship apart will be treated to a romance and love that will be stronger than ever. Seriously, the Shepard/Liara romance has the potential to be extremely deep, powerful, spiritual and incredibly strong. When the two of them get through this period, and eventually reconcile and reaffirm their love, this romance could be the most powerful and deepest yet. Liara loves Shepard deeply, Shepard loves Liara deeply, and they both trust each other. If said trust and love is maintained whilst they are apart for the time being, the the reconciliation and subsequent growth of the relationship will be epic.
I think the Shepard/Liara love story has incredible potential, and could very well be the deepest of all romances. I just hope BioWare follows through with it.