I would say of course it's ok to marry someone you love! To marry someone you don't love at all, I can't see how that spiritual union could ever happen anyway, making the whole point of anand karaj pointless. Think about it... you are placed side by side with someone you have absolutely no feelings for emotionally... how can two people that feel that way (no feelings for each other) lay together and make a child? A child should be brought into the world through love. Also, how can two people create that spiritual bond between themselves as partners for life and on the same spiritual journey if they do not care about each other?
Yes, Sikh parents help find a suitable match, but the couple must both agree... and if they don't have any feelings (you know, that 'click' just isn't there) then they should not agree because in my opinion, for the spiritual aspect of anand karaj to happen, its not merely the ceremony that makes it happen... it's the connection that the two share... and it just can't happen with two people who do not love each other as husband / wife. For all intents and purposes, a forced arranged marriage, or even one based purely on 'ticks in the box... career, wealth etc, and not on love and caring) then they can do anand karaj all they want, but the actual spiritual union still won't happen. It's not some magical ritual.
I simply could not marry someone I did not love. Because it would feel like a friendship (at best) and not a marriage. And I could never... you know... with that person so kids would be definitely out of the question. How could that ever result in a spiritual union? So I think both needs to be there... the will of both partners to make the commitment in front of SGGSJ, and their love for each other that causes the spiritual union to happen. And if it's true, that marriage would never be broken.
So I think 'arranged' marriage is a misnomer... arranged in the sense that someone helped to find suitable matches, but it is still up to the two people to decide if they 'click', if they have feelings etc.