Mar?
Why do that to the man's name?
Pretty sure Marbury would guard SGs and House PGs. I'd rather not to have the 2 of them together out there though, for the reasons you pointed. I don't think shot-blocking is that important - it's surely not the quintessential help defence.
In all fairness, I must say I've watched Marbury playing very good defence multiple times, when he was felling like it. This is nothing that makes me feel more comfortable though.
Yep, Marbury would defend the opposing two guards and he's capable of doing a good job there too. He's got enough strength to hold his ground against most shooting guards and more quickness than most shooting guards. The Knicks used him a fair bit against opposing two guards a couple of years ago and he did fairly well there.
what qualifies as "fairly well" for you....My sense of Mar's defense is to go for the steal which puts a huge amount of pressure on the rest of the defense...especially if he is playing with no shot blocker...
Our D is based on staying in front of your man, and that IMO is not something he has ever really had to do...certainly not the with the amount of consistency he will have to in our defense...he's always been a gambler on D.....
Rondo does that too (although less of late), but Rondo is also a great help defender which makes up for his gambles...
Fairly well = mediocre or slightly above average
Marbury doesn't do it consistently but he's capable of it and has done it intermittently. Also, I think he defends the two better than the point, he has a lot less trouble denying dribble penetration there and his strength helps offset his lack of height/length.
For the most part I'd rate Marbury's defense as decent. Not good, not average, but not bad enough to wipe out kill you or wipe out his positive contributions.
Defensive effort is the big thing with Marbury. He's been inconsistent throughout his career with it, and has had poor spells, decent spells, and solid spells defensively as a result. I think it's impossible to tell which one would show up in Boston when surrounded by these type of teammates.