As someone who honestly likes ALL the squad members, I like the humans well enough. Here's what I think of them:
Ashley: I can see why people hate her, but not to the point that people want to willingly leave her on *spoilers removed.* Yes, she doesn't like aliens, but she has a reason for it. A very in-universe reason that, the way I see it, isn't an excuse at all. And being hated just because she believes in God? Guys, save that hatred for Christians for the Westboro Baptist Church.
Plus, from what I've seen, she looks pretty in ME3. Though she was already pretty easy on the eyes in ME1, she looks like she's gotten an upgrade. Also, she says some of the funniest lines in the game, particularly if you bring her with you to Feros.
Kaidan: He's pretty cool. He's one of the most versatile squad members in ME1 if you build him right, and he's got an interesting backstory, and he's pretty fun to talk to. He's the one true love for my main FemShep, and he's got a cool voice.
Then again, I liked Carth Onasi from KOTOR too, so maybe I just like guys with past issues and need a woman to comfort them. Probably because they remind me of me.
Jacob: One of the least interesting squad members you pick up, but then again, I'd rather have a BLAND character than a BAD character. He's an all-around rounder in the game, and he's got some insightful comments on the Normandy, so there you go.
His romance path is seven different flavors of cheesy, though.
Miranda: She's a typical Ice Queen at the start, but if you get close to her, she definitely does get more endearing as time goes on. Sure, she's a Cerberus nut, but you kinda look past that once you see her issues with the past.
Plus, as a Sentinel, she's the most versatile squad mate in ME2. Always good to bring along if you don't know what you'll be up against.
Jack: Words cannot express how much I love this character. She's got easily the best backstory, she's got the funniest lines in ME2, she's the most unique looking human member, and her romance path is one of the most rewarding ones in the game.
She's not all that great gameplay wise, but story wise, she's easily the best character in ME2.
Zaeed: He's alright. Sometimes you just need a badass, and Zaeed is the second most badass human character in Shepard's crew (After Shepard, of course.). It's fun to listen to his war stories after every mission, and some of them literally made me laugh out loud. Plus, he's got Disruptor ammo, which can be upgraded to Squad Disruptor ammo. This makes him invaluable to bring along to missions with geth.
Kasumi: My second-favorite human squadmate (though considering I had to pay seven bucks to meet her, she'd better be good). She's useful in combat, and really endearing as a character in her own way. Her voice is just perfect, and she's actually funny at some points. I really like her.