Draw possibility criterion?

[friends]

Sometimes (for example when deciding playing turn or not with medium/bottom pair) it recommends to do this if you have the chance of having draw or straight nuts on the turn: you have 3 of 5 needed cards.
The possibility of getting, for example, two more spades on the turn and river (if you already have 3) is about 4%, and pot odds shold be at least 1:25 and even more, (cause probably you will have to pay a bet on the turn for you draw).
So, the question:
Is it really worth regarding such criterion?