Indeed they are.  It's on pace to outdo Winter Soldier by 344M, which in turn outpaced First Avenger by 344M.  They managed to turn a franchise around from a film that lagged behind Superman Returns to a contender for a place among the coveted Top Ten Grossing Movies of All Time.  

Any expectations it would be competing against the Avengers would have been completely misplaced considering that

1) The original plan was to compete head to head against Battle v Superman, but DC recognized a stinker when they saw one and rushed the opening release by about 2 months to avoid a box office bomb.  The division of audiences would have resulted in Civil War performing lower than it currently achieves---and initially there was expectation to be directly challenging X-Men: Apocalypse even sooner.  Optimistically speaking, Captain America would only haul about 800M (though BvS would have likely only taken 500-650M).

2) It was released in 20 fewer territories and had less of an advertising push than Age of Ultron, by itself rendering it inevitable to fall short of this.

3) The Chinese government frowns on anything with "America" in the title, so the execs knew right from the moment they called this movie "Captain America" and not "The Avengers" that they were going to be alienating a sizable portion of the largest Foreign territory.

If anyone is sad, it is this guy:

And maybe Snyder if he gets thrown out of the Director's Chair for his crimes against cinema.  And certainly everyone who spent money on making BvS, thinking that it would be a competitor against The Avengers.

In my opinion, they aren't. 

Please note the date and time: it is now official.  Captain America: Civil War has surpassed Batman v Superman: Dawn of Justice in every category.  

Here's the breakdown:

Domestic Gross: 347.4M vs 328.4M
Foreign Gross: 706.1M vs 541.8M
Worldwide Total: 1.0535B to 0.8702B.  In the top 25, it is poised to knock the Dark Knight Rises (1.0849B)down a peg and now competes with Iron Man 3's 1.2154B.

But that's not all.  In addition to be a commercial success, it is a critical success as well, killing Batman and Superman faster than you can say "Martha".

Rotten Tomatoes
Tomatometer: 90% vs 27%
Average Critical Review: 7.6/10 vs 4.9/10
Fresh Reviews: 275/307 vs 91/332
Audience Score: 91% vs 67% 
Audience Review: 4.4/5 vs 3.6/5

IMDB: 8.4/10 vs 7.1/10
MetaCritic: 75% vs 44%

This is an uncontested smackdown against the biggest heavy hitters of the DCU.  BvS could have great, and indeed it should have, instead it is the latest to showcase how not to make a superhero movie.  The 90's had Batman and Robin.  Then came Daredevil.  This decade it is BvS.  

How do you feel?

This one is for the tinfoil hatters out there (you know who you are).

I agree with you on most of everything except for a few things. First, Daredevil wasn't the worst superhero movie of the 2000's. Catwoman was far worse. In the 2010's, Batman v. Superman isn't the worst either. In fact, I thought it was decent and I think it gets way too much hate. If anything, the 2015 Fantastic 4 movie is the one you can compare to the likes of Batman and Robin. That movie was a trainwreck in slow motion. I say that because you never heard anything good about the movie even long before it its release.

Forgot about Catwoman.  Gonna edit that.  F4ntastic or whatever the Hell it was called was awful, and if not for BvS, that movie would definitely be the cautionary tale of the decade (thus far).

Steel is worse than Catwoman. Trust me on this.

Elektra has everything beat