Parents do have lots of experience with life and relationships. You should always give a thought to their opinion and if you feel that there is a point in their opinion then you should take that very seriously. If he is strict, conservative, and overtly possessive then you should remember that these are the qualities which can create suffocation in relationship at some point of time. Always try to respect your family values, in a long run it pays. Try to take your final decision keeping these things in mind.