Well as MaleShep I have no problem at all. He is your Mr. 100 % Correctness..... I Actually never found any real use as a squadmate, especually on insanity, but that's just me.
As Femshep i always disliked her dialog approach...., I just want to taaaaaalkkkkk for a biddd.... yammm. At least that's how it feels, even if you are not interested. If you romance him, he cheats you..... no PhD, no love Sis, sorry. But still buddies, right? What a yerk.
I actually liked Jacobs character, he wasnt as good as the rest of them but, he does have some good dialogue and backstory aswell as being honest with you about his thoughts on certain subjects where other Squad mates tend to sugar coat it