I don't know... The series that is an instant classic (TFC vs. Montreal in the conference finals) was only differentiated by goals in my eyes. I didn't see last night as a tactical aberration. Lots of hoof and chase and little organization.
Not even the biggest MLS fan would try to compare MLS to the Premier League and its peers.
That's not fair, either. If a country with a weak tradition in, say, basketball, relative to its other sports and the size of its population, started a basketball league, it wouldnt be fair to compare the level of play in that league after 21 years to the NBA - which, in addition to its elite domestic player pool, pays top dollar for the cream of the crop of international players.
MLS is financially stable, and growing, with cities pushing to get franchises. Some franchises have passionate local support, in certain cases even with or ahead of franchises in the traditional four North American team sports. The level of play and quality of player is steadily improving. A random MLS game, while certainly not El Clasico or even as good as two of the better teams in the Championship playing, is entertaining. That's not bad for 21 years. Room for improvement? Absolutely. The clown-show rules for player acquisition and roster construction need to be scrapped, for one. With regard to the product on the field, which is more to your point, a big problem is the relative lack of sophistication in strategy and tactics in MLS as opposed to the elite leagues. It's admittedly no comparison.
So the discussion here is, I think, whether what we saw last night is the best that MLS could put forward, given its current state. The consensus seems to be no, due to playing in Toronto in December, and maybe due to the clumsy playoff system, and a half a dozen other things.