When I was running QD Moth on a Sun Team, I was running Bug Buzz, Thunder, and Focus Blast. There were many times I wish I had a Psychic move, not too many times I wished I had Blizzard. Of course, that's partly due to my specific team, and I don't want to generalize... but I think the buffed BoltBeam is overrated.
That being said, I've basically concluded personally that Sun, though I was very much in favor of it on Day 1 (see earlier post in thread), is not all that great. As usual.