¡Fue tan interesante!
I was sure that this would have been ¡Era tan interesante! Because I thought that the imperfect was used when describing something?
Freeform Writing Exercise A2
Have a look at this video which explains why you use fue rather than era.
If we use the Indefinido fue in this sentence this is because we see this event as something that is completed/it had an end.
If we'd used era, then the focus is on describing that event.
Here is a Kwiziq lesson that will help with the understanding of these tenses:
Using ser in El Indefinido vs El Imperfecto
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