This game is certainly not just a port, even though the general story is the same as its DS counterpart.
The main difference in the mission outline comes from this side story, which are completely new missions that you would not have seen in Under the Knife. The final section or two of the game also feature a very different storyline that what you would expect. The gameplay is similar to Under the Knife in the sense that there is a time limit and you a forced to complete an operation before the time runs out, or before your patient's vitals reach 0. You can recvor your patients vitals by using the seringe on the wheel. You select the various items at your disposal by using the nunchuk attachment. Also on that wheel you have, suturing, scalpel, laser, maginification ultrasound, suction, antibiotic gel and forceps. You control your cursor by pointing the Wii Remote at the screen. The missions start off fairly easily, and then progressively get harder until they actually are very stressul even for the player. Sometimes theres a mission that ramps of in difficulty compared to the one before it , however. There are also 3 difficulties to choose from ,if you get stuck on one mission, you can try it on an easier difficulty first.
The graphics arent necessarily realistic looking but they do have a certain style to them that will stay in your mind for quite some time. The sound is the same way, there are a few really great tunes that accentuate the seriousness of the points in the story. Overall this game is not just a port. Those who liked Under the Knife in any way will get even more out of this game.