The multiplayer has a huge number of issues with it, and as much as I wanted to love it - it's just not very good.
Main issue is that it's not actually very fun. Particularly on the consoles, the engine just doesn't hold up well enough - the frame rate is sketchy at best, and often combat feels like you're fighting the targeting system more than anything. Whereas ME multi-player translated perfectly because FPSs are a known and done thing, Dragon Age was creating a real time version of a turn based system that just doesn't play very well. They also spent way too long before addressing some of the insanely glaringly obvious issues - it is not fun to have enemy archers one shot you from across the map, and having to play "hide and seek" round the corner with your team to avoid them was just dumb. It honestly felt for a long time like the designers weren't actually playing the multiplayer, because it took them far too long to start fixing these things and I think a lot of damage was done by the time they did.
Secondly, the loot system was practically criminal. Again, it worked in ME3 because every item was in some negligeable way worth something, because it eliminated further drops from the pool. Also, each gun handled differently so there was personal preference and choice in your gear. In Dragon Age, a stick is a stick - you just want the fattest numbers, and all those common low level items do absolutely nothing for you. In addition, the drop rates were simply wildly, wildly too low - as someone who paid RL cash in the multiplayer, and felt incredibly cheated by it, I would never pay money again in an EA game in that way. As someone who ended up spending more in Me3 multiplayer than I paid for the game, and doesn't regret it at all, that's a bad sign - but when you only get crappy blue runes in the chests you buy, it leaves you feeling pissed off.
Ultimately, it was a valiant effort hamstrung by the games basic engine itself and combined with the most abusive, god awful random loot system I've ever seen in an online game with microtransactions before. Free to play Japanese phone games don't abuse their players as much as the chest system did at launch.