If i recall correctly, he missed the entire season because he refused to get surgery in the offseason and tried to rush back(wanted that new contract) against the opinion of multiple doctors...only to realize that wasn't possible and was put on IR after 1 game. As well, during the draft this year, the Chargers had a(or a few) trades lined up, but couldnt get it done because he and his agent couldnt agree to contracts with the new team. The past few years, there always seems to be "some reason" as to why Merriman can't get back to his previous form, and in that time span he has made extremely foolish decisions. The guy seems to only be out for the money and has damned his team in the process a few times over(and ironically, his career at the same time). To be fair, he did fire his agent after the draft fiasco.
I know im in the minority, but i would rather wait and see what we have on the team. If there is one position Parcells knows its outside linebacker, and he did approve of signing Wake(whom paid some dividends) and drafting Misi. Mike Nolan made it work in Denver with just Dumervil, who was playing a new position, and if anyone can squeeze blood from a stone it should be him. Right now, ill take mostly unproven talent over a guy who hasn't been healthy or productive since he stopped juicing.