Is love simply one of the attributes of God, one of the more important attributes of God, or is it the entirety of who God is?
All attributes are equally important, you cannot remove one and have the same God.
Is love equal in importance to faith or is it subordinate to it?
For me understanding the difference is about (trying and failing) to understand the nature of God an what it means to be sanctified and become more like Him. God embodies love perfectly in everything He does. I don't actually know if Faith is technically an attribute of God but I would imagine it's a similar situation, that whatever we do that we call faith is also perfectly embodied by God.
Anyway, what I'm saying is that we have our paltry version of Love that we can pantomime without being saved then by grace through faith we begin to be sanctified and better able to Love.
Do we truly need to love our enemies or was Jesus using hyperbole?
Not hyperbole. Not sarcasm. He did not say "What are we to do? Love our enemies?! lol jk". He said to love our enemies.
Do you think some Christians put too much emphasis on love or do you think they don’t put nearly enough emphasis on it?
You can easily find both extremes, of cage stage or legalist attitudes that present Love as being of lesser priority than rote doctrine, and attitudes that lose sight of a real doctrine of Love in favor of a shallow "feel good" theology. As a fallen human I find myself swinging like a pendulum between the two from day to day.
Someone that is of eternal fascination to me is the unenumerable completeness of God's love. That all thing He does/has done was/is/will be perfectly loving to all people in all places at all times. You hear common wisdom that it's loving to always/never/sometimes do one particular thing to others but that wisdom is always from such a tiny temporal perspective. If we had eternal perspective we could truly love by making all of our actions perfectly loving but we don't so we can't. We can only pantomime bits and snippets and cave shadows.