It is often claimed that God is not as loving in Islam as in Christianity. It’s not so obvious, though.
The thing is, love is a word in English that is not easy to define – it has a whole range of meanings. It could even be equivalent to rahma (mercy) in Arabic, in which case God is definitely loving in Islam.
The Quran has verses which are translated as “God loves…” or “God does not love…” followed by types of people. These always made me bristle because I previously assumed God loves everybody. But the Arabic word for love used here is yuHibb, which can also be used to mean “he likes”. This is just my uneducated opinion, but it seems to me that these verses may be talking about what pleases or doesn’t please God, as opposed to an equivalent of what we mean by “love” in English.
Real love is not necessarily gushing and emotional stuff. Real love could be more like, an honest, constructive and encouraging appraisal, with a commitment to never turning one’s back. God is something like this in Islam. A sinner can always repent and be forgiven.
There is also the aspect of caring for the welfare of someone… that is part of love too. I think this type of love is only extended to believers. (See this article.) That is probably the main difference in God’s love between Islam and Christianity, because in Christianity the caring love is extended to everyone. But in Christianity it is difficult to reconcile God’s caring love for sinners with their eternal punishment in hell (if they don’t believe).