Well, if you say so!

Still that doesn't change the facts and the numbers/statistics speak for themselves.

Not in the slightest. Halo has remained the same in popularity while other games, mainly CoD have exploded along with FIFA.

Minecraft is Minecraft, its a phenomenon.

Silly thread.

right, stats speak for themselves

http://www.vgchartz.com/tools/game_comparison.php?reg=Global&ending=Cumulative&game[]=Halo+4+%28X360%29+[51758]&game[]=Halo+3+%28X360%29+[6964]&game[]=Halo%3A+Reach+%28X360%29+[35024]&game[]=

in the whole thread everything you said was wrong, why do you try so hard lol

btw reach is not a game of the main series, i'm sure you would argue about god of war ascension that it makes sense to sell less as gow 3.

The multiplayer is great on Halo 4. I can't believe MW3 is higher.

Why is this thread still open. By the OP's logic every PS3 exclusive is a flop.

They need to add smaller maps and proper ranking system in order to lure people back to Halo 4.

It wasn't as good as Halo 3 but it was still a good game overall.

Well its completely wrong calling it a flop cause its a huge success. Ofcourse it was always dwarfed by Black Ops 2 from the beginning, but in the first few days it was able to get pretty huge numbers.
There's a few reasons why the population has fallen:
1. Many Halo fans complain that they didn't like the changes to the multiplayer
2. Lots of lag and connection problems. It was getting ridiculous at one point.

Sometimes Halo Reach and even Halo 3 have more players online than Halo 4 which proves that even many Halo fans don't like the multiplayer.

Also, 343 made a system where players could progress up ranks if they had a code, but at first this code was only availble for the legendary edition but they changed this and decided to give players in certain countries the code to progress pass SR 70. This frustrated players in countries where the code was not given and also, they did it a very disorganised way, where many people even in the eligibable countries were not given the code. They then took 2 months to finally give everyone the ability to progress pass SR 70 but by then it was too late. 

according to some definition on this site it would be a sales flop.

I doubt Microsoft cares with those sales figures.