In my own little opinion, love of and by itself is not enough to conquer all. Love can not magically make two incompatible people compatible, for example.
It's a hard lesson to learn, but compatibility is important. Most relationship problems can be solved simply by good partner selection.
Fortunately, love is not scarce. We share a world with seven billion people. Opportunities for love are all around. A loving relationship with a compatible partner is far, far better than a loving relationship with an incompatible partner.
So you see that it's not just about the love in itself, but also about the people involved.
Compatibility does play a part. That true. What I was referring to however was the love of God which is an unconditional love. But yes I get what you are saying because even many who say they love someone can end up in a broken relationship.