As i said in the other thread, i recon they made the mistake of releasing the game to soon and unfinished.
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This game had loads of potential, with just 6 months more they could have had the game release with everything it has now and then used the PvZ GW model for its DLC packs (free DLC funded by buying burn card packs/cosmetics whilst also earning them in game). It released with to little content, poor optimization, funnelling people into attrition (HP/CTF point changes etc), bad match making (also no browser on PC) AND then they released community splitting DLC - then add on pissing off PC players with removing modes (at least they added them back).
Its been great that they've supported the game with updates, but titanfall was mismanaged from the start and its no surprise its dropped its population so fast - especially on PC.
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Like I've said before, they need to scrap the map packs/season passes and make all map packs available to all for free, in return give all map pack/season pass buyers a bunch of black market credits and cosmetics, then release a TF complete edition at a decent price and put the game on a good sale - If if they don't do something fast just think what will happen next month with the population numbers (COD release).