Reheat cooked meat in microwave
You are going to find a considerable variation of quality when re-heating meats or meat dishes, by any method, including the microwave.

Much of this depends on what the particular cut of meat involved was, and how it was prepared or what part of the dish it is in.

Some meats simply reheat better than others, and some cooking methods promote a more reheatable dish.

Reheat Well

Slow cooked cuts, like shoulder or chuck, that are traditionally cooked for several hours or more in a number of methods such as a braise, a barbecue or a tagine tend to reheat very well by any number of methods, including the microwave.

There should neither be an off texture nor an off smell.

For poultry, the dark meat tends to reheat better in these types of meat.

Reheat Poorly

Simple, fast cooking methods like steaks or chicken cutlets tend to reheat poorly, by any method, including the microwave.

This is because it is difficult to rewarm them evenly without actually overcooking them the second time.  Once they become well done, even if during the reheating, they will be tough and rubbery and unpalatable.

The microwave is especially difficult, because it may not heat the piece evenly, and so it might overcook and turn rubbery at the tips, while it is still cold in the center.

Your best bet is to lower the power setting at the cost of taking considerably longer to reheat.  Make sure to turn the food over several times, during its reheating period, and if your microwave does not have an automatically rotating carousel, rotate the food as well to promote even reheating.

Even so, you will never get it hot without significant risk of overcooking.  Aim for just getting the chill off, or moderately warm at the top end.

Beef steaks are especially challenging as they are lean, and people are so sensitive to how much they have been cooked.  You might be better off slicing them thinly, and eating them colder.

Aroma

The main challenge in reheating meats is maintaining the texture.

There is nothing that happens in a microwave that should lead to a bad smell.   Sometimes the microwave itself may need a little bit of cleaning.