Absolutely, you have to do so many and it's so repetitive. I just responded to a guy who said i was wrong about exotics dropping. He said "I've done plenty of strikes and haven't gotten any". He had 80 strikes done, I didn't even start getting them until double that (which is what I had said). The only reason I grinded strikes so much was the lack of having a raid team, raids are much more efficient at getting exotics