A simple advanced search would be nice.

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One thing I've noticed is that the amount of attention what I submit gets depends almost entirely on when I submit it. This suggests to me that, like insomniasexx said below, most hubski users browse exclusively off of their feeds, rather than going exploring at all. This is sort of a subreddit effect -- when I use reddit, I only browse off of my front page, and then occasionally off of the front pages of specific favorite subreddits. Similarly, I think most hubski users browse their feed, and then sometimes they move to the top posts of a few of their favorite tags as a second option. This is just based on my use of tags and observation on what gets shared and commented on.

This encourages monochromatic tagging (see askhubski) and submitting only at certain peak times, which is bad. It also fails to promote exploration of the site, getting out of your comfort zone, etc. The overarching problem is that we don't all have hours a day to spend on hubski, so we tend to spend what little time we do have reading the first few things we see that are related to our interests.