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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If there's time. I do it. Run to the end, kill boss. Get 7500x1.25 experience for whatever exotic I'm leveling at the time... When I run out of guns to level, I'll probably stop running them