1 assault, ball and/or extraction(the only non shit 343 original gametype, 2 plot please) need to be back. i'd say hill too as i enjoy hill more than sh which basically the bastard child of hardpoint and domination but i can live with no hill if assault and ball are back.
2 breakout needs to go unless the maps are changed/ shields are 100%
3 orion and pegasus better not ever return to arena
4 and lastly, slayer needs to go. take a hint from the COD scene, it's garbo for halo 5 anyway.
the ideal setup would be ctf, hill, assault, ball or extraction on which ever maps work best for them.