I would definitely argue that Capulet does indeed love his daughter Juliet. However, he also has his character flaws. He is prideful, arrogant, and very hot tempered. Not only do these character flaws show up earlier in the play, more importantly, they show up in Act 3, Scene 5 when Juliet refuses to marry Paris. Hence, Capulet's ungoverned display of character flaws in this scene makes it seem like he doesn't truly love her. We must also remember that in this time period, parents expected absolute obedience of their children. An offspring showing his/her own opinion simply wasn't tolerated, and his reaction to Juliet's insistence on following her own mind also makes it seem like he does not truly love Juliet.
The first evidence we see showing that Capulet truly loves Juliet is with respect to his first answer to Paris's plea for her hand in marriage. In the very second scene of the play, through Capulet's response to Paris's request, we learn just how important Juliet is to Capulet. We learn that as his only child left, Juliet has become very important to him, and he is not just yet willing to let her grow up. We also learn that he values his daughter's opinion, and will only consent to Paris's request if she agrees as well, which is positive proof that he does indeed love is his daughter, as we see in his lines:
My will to her consent is but a part.
An she agree, within her scope of choice
Lies my consent and fair according voice. (I.ii.17-19)
However, while he does love her, he also has character flaws that make it seem like he does not. We see his flaw of having a fiery temper in the very first scene when he is presented as the first one to join in on the servants' fight. He even blames Montague for the fight, even though Montague joins the fight after Capulet. Placing blame on Montague also shows us his character flaw of excessive pride and arrogance. Hence, it's no surprise that these three character flaws emerge when Juliet refuses to marry Paris, especially considering he made the decision to have her marry him because he saw it as a healthy distraction from what he perceives to be her severe grief over Tybalt. The fact that he considers her excessive grief to be a danger to her and wants to help her out of her grief again shows us just how much he loves her, despite the fact that his character flaws also drive him to threaten to disown her.