Eh views on MGS aside the voice acting was not great, The music was alright and the animation did not lag and was solid so it was alright.
My own opinions on MG and MGS however are quite diffrent yours obviously. Big Boss to me was while not wholly needed as plot device at the end did end up explaining quite a bit, about exactly what happened to him after Zanzibar land and How he and the patriots had their falling out.
Did he need to be alive and walking during MGS 4? thats up for debate but i completely disagree that he was completely uneeded when the entire game basically centered around the Patriots and Guess what? He was a founding memmber.