Worst Attractions: Tiki Room under New Management, Journey Into Your Imagination (by word of mouth it STILL was awful), Journey Into Imagination with Figment (just trite, especially compared with the original), Food Rocks, and the truncated Studio Tour. In fact, most of the rennovations in the late 90's seemed to make some pretty bad attractions.
To round out the list, however, I have always thought Living Seas was lacking as was the original UoE and SYmbiosis.
What's really sad is that Disney, in the earlier 90s really did a fairly good job of turning tired, old attractions into great replacements. The replacements were not always the best shows, but they were better than their predecessors. Those would include Timekeeper, Buzz, Alien Encounter, and Ellen's. Hopefully, this trend will return (since the Land's rennovation, overall, has added new hope).