Pre the DLC, I would make sure I did the daily in an attempt to get Ascendent Material to level up my armor and weapons. Post DLC there's really no point to do the daily missions especially if your weapons are already maxed out and you have the new Raid Armor. I haven't done a daily in a while and the only time I do is when one of my friends is doing it, but I just usually join for the conversation
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Depends. I don't need shards but I always need energy, and the XP boost is great if I'm leveling guns. However, I refuse to do any DLC missions for the daily. They're just too damn annoying to solo at level 30, and they come up wayyyyy too often. But, if it's a pre-DLC mission other than The Black Garden (also way too long and annoying) I will probably do it just for the hell of it. Only takes about 15 mins anyway.