"many tend to" is a correct and usable phrase in written English.
It is usually used to describe a general tendency or trend; for example, "Many tend to agree that this policy is beneficial."
Some are fine, but many tend to be rather indifferent mixtures of crabmeat and bottled mayonnaise.
Many tend to focus on hurting opponents rather than helping their own people.
Cashews Nuts, for many, tend to work far better than fruit as a between-meals snack.
Meek's characters, and there are many, tend to be morally questionable.
One thing about editorial pages in general is many tend to not surprise people.
Many tend to be clunky, and the maps they contain are often outdated.
To the extent that others are aware of it, many tend to write it off as an American problem.
Art-loving newcomers with an enthusiasm for experimental work show up, and, according to NYCB, many tend to return.
"When these kinds of attacks happen and when its starts affecting your personal life, many tend to give up.
