I haven't played DA:I MP.
Mass Effect was a single player game, until EA bought BioWare and an EA VP decided no games without an MP element. Dragon Age was single player game until EA.
Putting an MP element into these games allowed EA to force people to use Origin on the PC. When ME 3 came out, it took a while to bite the Origin bullet but I wanted to finish the trilogy. ME 3's ending didn't offer me a lot of replay value in SP mode but I found I enjoyed the MP a lot except for the stupid RNG chests. I found that Mass Effect's MP game offered more RPG value with all the different classes and races than the SP mode; so, overall I got my money's worth out of the MP instead of the SP.
I do wonder on both games, what if all the resources/funding went into the single player game only? Rhetorical question with EA's attitude–it's not going to change.
When Dragon Age: Origins first came out, I got it on the PS3. And within short order switched over to the PC. Stayed with the PC for all of ME. Wanting to avoid Origin, the new DRM scheme and the mouse/keyboard complaints, I bought DA:I for the PS4.
While I've no objection to an MP version of either ME or DA, I didn't buy and play these games for the MP. And looking forward to many of the games coming out that are only single player, like Witcher 3 and some of the indie games.
I really looked forward to Destiny (Activision) both as a single player and multiplayer game but that just turned into another RNG grind to nowhere. There's a corporate curse that comes with too many games now.