I recently came back to Halo 5 because of Heroic WZFF. However with 8 maps it is a little sparse. So tonight I tried Score Attack, and it is a lot of fun. It has a WZFF feel to it because of all the medals and emblems coming across the screen after kills. The only down side is a lack of req points, but I am playing for fun, and will balance it with regular WZFF. If you haven’t tried it you should give it a go I feel like it has added 14 maps to WZFF for me!
The only thing missing PVE wise in Halo 5 in my opinion is a 4 man firefight that could be played on all the multiplayer maps. If they could make that with round and game options with ai/drop in and drop out co op. It would be phenomenal. I am glad I revisited Halo 5. Such a different and game and experience compared to the launch version.