TV Addict has a retrospective article on Merlin published before the airing of the last episode. Excerpt below:
"Whether MERLIN ends tears or laughter, we feel privileged to have shared its five year journey. We loved getting to know Merlin, Arthur, Gwen, Morgana and all those jaw-droppingly handsome knights. We even held a soft spot for the curmudgeonly King Uther and his faithful friend Gaius. Then we were in absolute awe of the Great Dragon who looked so regal and imposing even in his final days. There has been much to marvel at over the years and we loved every second of it.
Thanks for inviting us along to peer into the magical world of Camelot and those who resided there. Of all that we shall miss, we shall miss finding out what the next chapter would have revealed. Surely there are more grand adventures to be had, if only we could have seen them. Thanks for the memories and know that you’ll be in our hearts forever."