#1 trait an inside linebacker needs to have is to shed blocks and make tackles in rushing defense. Maualuga wasn't good with his hands like other backers in this, he's a guy overhyped by the media because he roams freely untouched and then hits big. People see the hits on the UCLA QB running down the sideline and think "WOW, he's great!" however you run straight at him and get a man on him and he's neutralized. He doesn't shed blocks. Oregon State did this very effectively with Jacquizz Rodgers.
He isn't a pass rusher, and teams place a huge premium on LBs that can rush the passer. That's why you saw Larry English go 15-20 spots ahead of where top 100 boards had him. Demarcus Ware had a metoric rise a few years ago because he could rush.