I have seen a a few dead people. They do make a lasting impression and it is an unsettling one particularly if you have known/met the person whilst alive (even briefly, in my case as a doctor and in other healthcare roles). It is like a strange, sad, off coloured, cold and empty version. Like somebody has somehow constructed an imitation but what they've made is wrong. Nevertheless, not frightening, not disgusting. Peaceful.
And as well as what you see there will be other sensory aspects - the smell will be wrong (even if no unpleasant smells there will be a very different smell than in life) and there will be silence, stillness and a very different feel (if you touch).
Nevertheless I think I would choose to view my own loved ones. I just think if you choose to do so you must be prepared. It is the small details that connect the body to the person they were, like the hair, the hands, items worn. Try to remember that whatever expression you see on the face means nothing. The face changes the most, especially the eyes and mouth. You could consider viewing the body but not seeing the face.
To me it does not feel like seeing the person you knew, it feels like seeing something they've left behind, just a dead body. There's a closure in that but I think maybe it could be upsetting if you are hoping or expecting to see the person you knew one last time.
I'm sorry for your loss.