SI's Chris Mannix grades Celtics offseason a B-

The arrival of David Lee headlined Boston's offseason transactions. Sports Illustrated is compiling a list of offseason grades for each NBA team, one division at a time. Chris Mannix's assessment of the Atlantic Division was released today. One might think Mannix, a part-time Celtics studio analyst for CSNNE, would give the C's some hometown love, but instead his evaluation strayed in the other direction.

Boston's B- offseason ranked ahead of only Philadelphia's (C-) in the division, behind those of Toronto (B+), New York (B) and Brooklyn (B).

Mannix picked the Gerald Wallace for David Lee trade as the Celtics' best move of the summer, saying:

Lee will help. Wallace was an afterthought for…