I think it depends what kind of arranged marriage. Some of them may be called arranged marriages but the pressure is what makes them realistically a forced marriage.
A girl may agree without physical pressure, just the knowledge that this is her only destiny, and to me that is forced.
On the other hand the ones who happily go into an arranged marriage are not forced.
I agree, and will only add that a great many 'arranged marriages' are little more than 'introductions' and although there may be some pressure - it is NOT the same as being locked up in a room and forced to marry someone.
I'm not necessarily defending arranged marriages - but there is a difference.