Learn English – Common term or single word for someone who is embarrassingly over-complimentary

A person who has experienced many hardships throughout his/her life is an unfortunate.

Perhaps

pushover - a person who is easy to overcome or influence: Colonel Moore was benevolent but no pushover

or

patsy - a person who is easily taken advantage of, especially by being cheated or blamed for something

or

soft touch - (informal) a person easily persuaded or imposed on, esp to lend money

Of the three, the last is probably the most positive (at least in US usage). The other two suggest gullibility.