suggest me if i should go and watch harry potter 7 or not

If you have watched the earlier movies, then, you shouldn't miss the last installment.

Well, you already saw all the previous parts, so, definitely you have to see the The Deathly Hallows Part 2! I have to say that I was expecting so much from this movie, because I saw so many good reviews about this Part 2. I already saw two times the movie, one time in 2D and the other in 3D. There aren't much difference in 2D and 3D. In my opinion, the movie was below my expectations, but a lot of my friends loved the movie. It was a good movie, but some parts are totally different from what was on the book, specially the parts of the final battles. I'm not going to say much, because you didn't watched the movie yet! In my list the best movie was Deathly Hallows Part 1. The Part 2 is good, but it's no better.