While the original film was not exactly a cinematic masterpiece, it was an enjoyable movie for many different people. It worked because of Arnold's surprisingly excellent interaction with the kids. It had a balance of light-heartedness and seriousness as he flipped between his teaching job and his real job as an undercover cop looking for a witness. There were plenty of laughs, but when it was time to get serious, it actually did get intense and suspenseful.
This movie is such a disappointment. The people who made it seem to have watched the original movie, but had no idea why it worked. To begin with, the villains in this movie are actually portrayed as comic relief, rather than a real threat, which completely undermines any dramatic tension in the movie. You never once feel that the kids or Dolph is in any real danger, so there is zero suspense. Nothing is at stake. His partner embodies just about every racial stereotype under the sun, which is offensive and reeks of lazy screen writing. (I'd like to say the word 'screen writing' but IMDb is forcing me to make it two words. How ironic that a site 100% dedicated to film doesn't recognize that as a word.)
As much as I enjoy him in other films, Dolph seems like he's just kind of going through the motions here...it doesn't seem like he's putting forth any effort to connect with the kids or seem overwhelmed...he just gets lots of finger paint on his shirt and calls it a day. He never acts like there is any danger during the action scenes, further undermining any suspense that the audience might feel. To be fair, the script is poor, so he doesn't have much to work with.
As I mentioned, the dramatic element is tossed straight out the window, making this a straight-up comedy. But, there's a problem. I don't know who would find this movie funny...maybe Adam Sandler fans? Larry The Cable Guy fans? There is a scene of a fat man getting his nuts zapped with a taser that lasts about a minute, so that should give you an idea of the level of humor that you're in for.