Ok, ill bite...
- Did we somehow forget brilliant maps such as [Isolation, Epitaph, Cage, Spire, Paradiso]. And these were all launch maps.
- There were 11 and 9 maps respectively for 3 and Reach at launch, which included BTB/Invasion maps in the total. Halo 5 had 11 maps including 8 Arena and 3 Warzone maps. I am not including any of the forge variants being available in any game.
I personally prefer having good gameplay over all modes being available with shit gameplay (aka Reach &4). I personally cant wait to see these objectives in Matchmaking but I know from previous games that if given a seperate playlist to house all objectives, the playlist eventually dies a slow painful death.
This, you can throw 3 into the category of shit gameplay as well. 3 was made slower in a variety of ways, movement speed, equipment drawing out firefights, shield doors on a couple of maps as well as lift camping on Construct. Most of the weapons were pea shooters as well. I'd take Legendary BR's in Halo 4 over 3.
Then there's Reach, he complains about bad maps in Halo 5, but Halo Reach easily takes the cake for the worst maps in the series.
The original maps were designed for both multiplayer and campaign and they played horribly as a result. Boardwalk had no flow, half the map was useless. Reflection was ruined by jetpacks. Zealot had to be updated because it was poorly designed (same with Epitaph and Snowbound in 3). 5's worst maps don't even begin to reach the lows of Reach and 3's map design. Though it may not reach the highs of 3 either (Reach certainly didn't have any maps that exceed 5's in quality or balance). But he only seems to care about different aesthetics over gameplay, I won't discount the importance of visual variety, but gameplay should be considered first.
Both Reach and 3 both needed updates to their core gameplay as well, melee damage, bloom, etc..5 had the benefit of an early beta, but that's just good decision making. It's the first game that hasn't needed it's core gameplay balanced post launch since CE. 3 and Reach started the decline of the series' multiplayer, 5 is the upswing.
This isn't a defense of missing gametypes, but it annoys me greatly when people talk like Bungie was infallible, they made a lot of mistakes that carried over to Destiny's horrendous PvP.