The team presented their project with great enthusiasm,

Solution

"Dull" suggests a lack of interest or excitement, which does not fit the context of a positive presentation. "Irrelevant" means not related or important to the matter at hand, which is not suitable for describing an impactful presentation. "Troubling" implies causing concern or distress, which is not a positive description for a presentation. "Enlightening" is appropriate because it means that the presentation provided valuable insight or information.