Dare me ask, what’s bad about this vaccine in your opinion then?

I'm not sure exactly what you want here.

• It is completely unnecessary. SARS-cov-2 has very good therapeutics. You are more likely to die from the flu (which has apparently been cured completely). The data suggests the most likely causes of death from this virus are vitamin D deficiency, or already having one foot in the grave (cancer, etc.). If you are take semi-regular supplements of Vitamin D (with vitamin K), zinc, and magnesium your chance of death or serious illness from this virus are practically nothing. If you do get sick, taking ivermectin or HCQ in the early stage are excellent for keeping it from getting serious. The data suggests you are more likely to die from the vaccines than from SARS-cov-2 for most age groups if you are not vitamin deficient.
• The delivery system is bad. The PEGylation on the lipid nanoparticle can, in the doses it is being used, cause very bad histamine reactions (anaphylactic shock). How bad is this? Not really that bad, but a test should be done to make sure someone is not likely to have this reaction before it is administered.
• The mRNA is designed to cause an autoimmune response. I do not think this is automatically bad. I do think in this case, especially because of the very high dose, and because the nanoparticles are non-targeting (meaning they go into the bloodstream and can infect any cell) this autoimmune response can be lethal. If these infect endothelial cells in the brain for example (blood vessels), and the immune system attacks them, they could cause an aneurism. I do not know that this is what is happening in some people, but there is evidence that the vaccine is causing aneurisms in some people. I am only guessing at this point that this non-targeting effect is the cause. Studies should be done.
• All previous coronavirus (common cold, other SARS, MERS, etc.) vaccines suffer from something called pathogenic priming, where encountering the real virus after getting the vaccine caused a cytokine storm (huge immune and inflammatory response) that was lethal in, on average, 5% of the vaccine recipients. This effect was not studied in animals even though it plagued ALL previous vaccines. This is a violation of the Nuremberg code, and a crime against humanity.
• The data is being hidden and lied about. People are not being told that the death rate for this experiment is about 1:20,000. People are not being told that the likelihood for serious injury from the vaccine is about 1:200. And that's just with the data we (or I) know about. A paper from 2011 (sorry, can't find the link atm) said that only about 1% of real adverse reactions from vaccines were reported to VAERS (the CDC vaccine adverse reaction database, from which I got the above numbers). This lack of disclosure for this experiment is another violation of the Nuremberg code (the most important rule in fact, informed consent). This is another crime against humanity.

But from your professional observation, what is going to happened to those who took them?

I think the vast majority will be fine. As I said, about 1:10,000 to 1:20,000 seem to die, and 1:200 or so have a serious effect. Only some of those "serious effects" are permanent (blindness, paralysis, coma, heart damage, lung damage, brain damage, etc. (all of these have happened to many people, though I don't have the count off the top of my head)). That is if we assume the data isn't too far off (hopefully).

If there is a pathogenic priming effect, the next "SARS season" could be pretty brutal if these vaccines follow previous vaccines patterns (5% of all recipients die). This pathogenic priming effect likely gets diminished with time, and almost certainly gets diminished by not being vitamin deficient, so this problem may be reduced.