Great watch, will watch again, and do recommend.
Even if you haven't seen the first one, you can watch this just fine.
As much as I like this movie, the best part is by far the cg animated Disney Princesses: what a good tease for new CG movies, which they should have been doing instead of the live action garbage.
Again, as much as I like this, it is a bit of a deviation from the first movie with a bit of a mixed antithetical message to it. While the first movie focused on Ralph and his quest dragging collateral damage in its wake to eventually bring the characters together in a spirit of inclusion, this movie scales up in a weird way, showing the internet as a place of connected inclusion and then "wrecking it". Even the main story line is about Ralph's mission to fix things so they can maintain a status quo and Vanellope's search for change and "the new". It's literally about how they shouldn't be together, or maybe that they're still together even if they aren't.
It just gets weird real fast, and while J.C. Reilly and Sarah Silverman do a great job with their roles, you've got to operate with some suspension of disbelief that they can do any of what they're doing or that it makes any sense. They also deviated with how Ralph "wrecks" things.
Once you get past some of the nit-picky stuff, they're on a well structured adventure filled with charm and wonderment with lots of interesting characters.
I honestly would be surprised if anyone actively disliked this.