I can tell you from personal experience that joining metallurgy and materials science in one of the top NITs is far better than getting even CSE in the lower NITs like the north eastern ones. Surely you might think whether I should go for college or branch but you can always try for branch change if you dont like this branch. 

Also mostly government colleges teach this branch, and there are good PSUs like MECON, SAIL, BHEL etc which offer good jobs to metallurgists so go for it.