I don't have anything against free games with microtransactions if its reasonably possible for non-payers to progress as far as someone paying through playing instead. I especially respect companies that only allow cosmetic microtransactions.
Anyway, back to the topic of DA3MP, the terms freemium and pay to win cannot apply to DA3MP because of just how poorly iplemented the loot system is. The correct term you are looking for is "failmium". The $2.50 price gets you a large chest, which could also be gotten with less than 30 minutes of gameplay. And the chest has only a 5% chance at a unique weapon (80% of that 5% being less than level 15). Such a fail system probably has resulted in almost no one having any desire to buy the chests once they understand what to expect from the chests, and anyone buying the chests just paying to lose.
I have opened a total of ~400 chests, or what would cost $1000 USD. And for this I don't have any weapons that are best in slot except for a griffon bow, a superb cooldown amulet, and a superb life-drain ring. That's it. My estimates are you need on average either 800 chests or $2000 to get all level 20+ purple weapons, and on average 1200-1600 chests or $3-4k to get all of the best weapons and accessories.
With $500-2000, I could buy a near-best account with dozens or even hundreds of top tier digital items, with many hundreds or even a few thousands of hours put into grinding items, for 90% of existing MMORPG's and other games with valuable loot.
Or I could dump $4000 into these large chests of disappointment, spend about 5 hours opening boxes, and another 5 hours salvaging, and get about 15 unique items that are only really differentiated from other items by higher stats, life steal, faster cooldown, and a 10% chance at proccing some ability. Hmm no thanks. More creativity and effort is put into a WoW pet than into all of the half-dozen existing end game weapons in DA3MP combined.