The way I see it, these relic weapons are more of a status symbol of "I put a bunch of time into this". If you want to actually get a decent weapon, there have always been much easier and much faster alternatives (the weekly 3 ex primals, levi ex, UAT). Its true that *currently* nexus will be the best weapon for your character, but really besides accuracy the secondaries aren't really going to make a noticeable difference in most cases (the i115 will make a difference over the i110 weapons obviously). The relic weapons are long term goals to work towards, whether you think its worth it to work towards that goal is up to you.
Does the atma grind/lottery suck? Sure does, I'm currently at ~850 FATEs (tracking it with achievements because I've hardly done FATEs outside of atma) and only 5/12. But should it be changed? I don't think so. Come 2.4, you will very easily be able to get an i100/i110 UAT weapon and they will likely add another weapon that will be a little better than that. The relic weapon should still be for those who wish to invest all the time into it.
