I consider it a need, but like offensive lineman, I think you can find solid linebackers in later rounds. I'd be looking for the Bills to get a top tier receiving talent. Then look offensive line/Linebacker in the 2nd-4th rounds.
Then again, I don't really thinking drafting for need is a good idea. I think if you have a great talent on the board, you take him. I'd rather draft a great players into a position that is already strong than draft the best of the average at a weak position. I think free agency is better to fill holes.