Is this a good 4 week workout?

I read through the first 3 weeks of it, here are my thoughts:

First, it is marketed as a beginner plan, but it isn't really conducive to beginner success. Someone who hasn't lifted much/seriously before benefits more from compound lifts, teaching their muscles to work together properly as they build base strength. Most of these are isolation lifts, exercising a single muscle (which is also less efficient for someone only hitting the gym 3 times per week).

Now the meat of the thing. There are a number of elements that indicate this is built just like everything else Muscle and Fitness does - not to help you get bigger/stronger, but to get you to read their magazine/visit their site. There is way too much emphasis on isolating smaller muscles, without compound work for larger muscles. The rep range used works well for lighter weight, but prevents the use of anything heavy. For isolation work this is fine, but for things like squats you should be going heavier. This is a slower path to muscle growth, and a faster path to muscle soreness.

It is very biased towards the front of the body (front shoulders, pecs) and the arms. Without a balancing amount of upper back and rear shoulder work this will wreck your posture, and can lead to shoulder injuries. Biceps are overemphasized, like most programs - 1/3 of your "pull" day is biceps work, even though the back muscles do most of the pulling and are considerably larger than biceps. Also, your triceps make up a much greater percentage of your arm than the biceps, the key to nice looking arms is triceps, not biceps. There is also an unnecessary emphasis on calves (1/3 of your leg day, do your calves look like 1/3 of the volume of your leg?). A beginner who is doing squats through a proper range of motion doesn't need to do any calf work, and certainly not a third of their entire leg day.

There are also a few blatant errors. Smith Machine upright rows on press day - these are a pulling movement, using pulling muscles. But this error costs you 1/6 of your pushing day.

All in all, this is a sloppily formulated schedule that is mostly created to generate website traffic/magazine sales, aimed at people who don't know any better and probably won't stick with it past the first week anyway.

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If you enjoy it and can stay committed, yes.