I'm replaying trough ME2 and eventually ME3 at the moment (vanguard on insanity, so much fun) and I understand being excited for it but honestly ME3 isn't the main reason I'm worried about ME:A, DA:I is.
ME3 had many problem but a lot are either easy to fix, already fixed in some way (EA seems to have learn there lesson on MP affecting SP) or very specific to ME3. For example, the fact that your choice had almost no effect on the outcome shouldn't affect MEA since its not a direct sequel. And some fix seems like no brainer, ie don't have an annoying child character in the game or pull out a random ending unrelated to anything previously in the franchise. Now some stuff still worries me, like Cerberus being turned into a cartoonish villain and introducing the lamest character ever (if anyone hasn't read Shamus Young break down of Kai Leng, do it!) but those are also fairly easy to avoid.
No DA:I is the real worry, it seems much closer to MEA since there both open world and DA:I is the most recent bioware game. DA:I combat was dumb down and nothing was introduced in its place. ME2 simplified a lot of stuff (less skill, few weapon) but for everything it took it added something interesting, there were less skill but each had far more effect and they all had two evolution at high level and unique skill for every class, less weapon but each function differently rather than just different number, no more infinite ammo but no more waiting for them to cool either and the addition of armor/shield made choosing the right power for the right enemy much more interesting (not to mention who to bring on mission).
DA:I just simplified and added exactly nothing, you couldn't customize your party member behavior, so they were all super dumb (ie archer walking next to enemy to attack them, mage dispelling negative effect afflicting enemy), they remove sustain ability and introduced nothing in return. Equipment was simpler and every variation still acted the same anyway. Story wise it was also a mess, major plot point where introduced and finished in the same mission "here's the cliff note version of this civil war, now decide who the winner is" and quest just weren't interesting. The large area where mostly more of the same with the first one (hinterland I think) being the only interesting one with some variety.