playing alone is impossible.
unless you are a tryhard who plays 12 hours a day, it is almost impossible.
I just played a raid and killed 7 people and there were still 2 left who threw 5 grenades at me, they rushed me and I managed to throw one and the other one killed me.
Playing alone is impossible, playing with randoms is torture because they will camp the whole raid and on top of that they steal your loot...