Well, I guess that is it, right?
I think the series finale was a fitting end to a great show. Of course, it had to be rushed due to Armstrong's leaving the show and the adaptations needed when Marian was killed and the Tuck character being added to fill in for Will and/or the saracen girl (sry, forgot the name now).
Alan's death was sad. Everyone thought he was a traitor and in the end, the old Sheriff finished him off.
On the other hand, Guy sacrificed himself to save Robin. He apologized and died freely and proudly.
I liked Robin getting together with Marian. I imagined he would. It makes sense. His true love.
Guy, Robin and Alan's deaths wouldn't be worth if Isabella and the Sheriff hadn't been blasted in the big explosion in the end.
Anyways, not showing them already together with King Richard was a good call, otherwise it wouldn't give this sensation of work not yet done. The series ends but their work isn't done. They move on, they fight for England and the legend of Robin Hood stays alive and strong. Oh yeah.
Cheers friends. It's been a good run.