I finished LEGO Marvel Super Heroes a few days ago. Although I'm not exactly a huge super fan of the Marvel franchise, I do like much of it, so I found the totally unique storyline presented in this game to be very interesting. No spoilers for what happens, but I will say that the featured heroes include the Avengers, Spiderman, the Fantastic Four, and the X-Men, and among the featured villains are Doctor Doom, Magneto, and Loki. In addition to the main story, there are also a dozen bonus levels (all narrated by Deadpool), which you have to find throughout the hub area after collecting certain various amounts of gold bricks. And then there's the hub area of the entire island of Manhattan to explore (not quite as extensively massive as I had feared, but it is a little harder to divide into manageable sections, unlike the hub worlds of the other Lego games I've previously played), with all kinds of things to do like collect gold bricks or tokens to unlock characters or vehicles (thankfully unlike the Harry Potter games, you don't need to collect tokens of characters you've already played as), either by finding them hidden around, completing quests (many of which have to be done in series, like in the Hobbit game), or completing races. While many character abilities are similar to most previous games (levitating objects into place, only explosives can destroy silver objects, only heat-based attacks can destroy gold objects), this game also introduces some new ones, such as the strength-based abilities of "big figs" (like Hulk and Thing). Also, much like the Harry Potter games had students in peril or the Batman games had citizens in peril, this game has Stan Lee in peril, and you have to rescue him from all kinds of crazy situations. Perhaps the most difficult aspect I found in this game is the races (especially the ones that involve flying, because even though the mechanics of flying characters are much better than they were in Batman 2 (the only previous Lego game to have flying characters), it can still be rather tricky to maintain enough control to complete these races), but I was able to get the hang of them pretty quickly with rather little frustration. So, after completing this game (and unlocking all 45 achievements on Steam), I have to say this one is very high among my favorite Lego video games, not quite my most favorite (that still belongs to the Lego Movie Videogame), but definitely good enough for second best (surpassing even Pirates of the Caribbean, which I honestly didn't think would happen, but I guess that's why you have to actually play these games to truly get the full experience and thus determine accurately just how bad or good it actually is).
Next on my list of Lego games to play; LEGO Batman 3 - Beyond Gotham
As with the previous game I just finished, I'm aware of the story content (completely original, also like the game I just finished), but not the freeplay content. This is also the first Lego game to have some DLC (downloadable content) levels (apparently based on some movies and TV shows from the DC universe), for which there are some Steam achievements, so of course I had purchased them all back when I bought this game. Speaking of which, back when I first got interested in Lego games and wanted to try them all (back in late 2015), this was the most recent game available at a low enough price, so completing this game will mark a huge milestone for me (even though I've still got a few more Lego games left to go after this one).
My rankings of all Lego games I've played so far:
The LEGO Movie Videogame
LEGO Marvel Super Heroes
LEGO Pirates of the Caribbean - The Videogame
LEGO Batman 2 - DC Super Heroes
LEGO Indiana Jones 2 - The Adventure Continues
LEGO Star Wars III - The Clone Wars
LEGO The Hobbit
LEGO The Lord of the Rings
LEGO Batman - The Videogame
LEGO Indiana Jones - The Original Adventures
LEGO Star Wars - The Complete Saga
LEGO Harry Potter - Years 5-7
LEGO Harry Potter - Years 1-4