Having a pretty pair of angel wings might seem awesome. Angel artwork typically has very appealing aesthetics.
But in practice, genetically engineering a pair of angel wings onto humans would be pretty messy. First of all, with these complex structures on our backs, we wouldn't be able to lean or sit against things, or lay down on our backs.
Secondly, the weight of them would be annoying.
Thirdly, cleaning them would be a pain, especially if they were feathery. Being on our backs would be the most difficult place to clean.
Fourthly, wings of such size would likely be fragile and painful if injured.
Fifth, muscles capable of flapping such things would be big and ugly.
Sixth, flight would be pretty fun, but ultimately exhausting and sloppy. I'd prefer to fly around like supergirl than like a clumsy human-bird hybrid.