I'll try to avoid spoilers, but there will be teasers :)
Not as good as Season 3 which was by far the best, but better than Season 4.
The awful dialogue and pitiful acting which plagued the first 5 or 8 episodes got much better although the ending let much to be desired (Not the last 5 minutes though, they were good). It was interesting to see Wesley becoming more and more psychotic. He certainly learnt to enjoy shooting people. They also seemed to enjoy killing off main characters, and seeing Lorne laying the smackdown on someone was surprising to say the least.
As much as I enjoyed it, I hope they will lay the series to rest as this really should be the end.