As far as everyone knows of the general situation of mixed marriages in Malaysia, I shall take example of the 3 biggest races:

1. Malay + Chinese/Indian = Chinese/Indian must convert to Muslim first.
2. Chinese + Indian = There are cases of converts, and some no need.

Many issues come into play when we're talking about mixed marriages.
One old saying of "when you marry someone, you are also marrying into their family" applies at an even greater degree in this situation since it now involves trying to adapt to new culture, new race/face, and new religion.
Unless of course if that person is already brought up in those environments, then its a different case.

And just like any other marriages; some works, some do not.
I'm not sure if there is a record of all mixed marriages in Malaysia, but I guess everything works out well in the end.

What is your take in this?

Yep, the bigger issue is on laws and religion.

Families of both sides need to somehow come to an agreement whether the relationship can end with a knot or not.

I would say mix-relationship needs to be taken into account from the very beginning, but who's to say one can stop love