Fair enough, Joe Johnson is playing for a new team and needs to learn the offense.
Lets use a fair comparison then - Per 36 Minutes numbers for four guys who did not play for the Celtics last season:
Jason Terry
16.7 Pts (51% FG, 69% 3PT), 4.1 Ass, 3.0 Reb, 1.6 Stl, 1.0 TO
Courtney Lee
14.4 pts (51% FG, 24% 3PT), 2.2 Ass, 3.5 Reb, 2.4 Stl, 1.4 TO
Jared Sullinger
15.1 Pts (56% FG, 33% 3PT), 1.0 Ass, 9.9 Reb, 0.4 Stl 1.4 TO
Jeff Green
17.8 Pts (49% FG, 44% 3PT), 1.3 Ass, 5.2 Reb, 0.4 Stl, 1.6 TO
Compared to our subject:
Joe Johnson
15.2 Pts (45% FG, 41% 3PT), 3.2 Ass, 2.4 Reb, 1.6 Stl, 1.9 TO
Surely you can see where I'm coming from.
Joe Johnson is supposed to be an All-Star and the second best player on that team, and we have four bench players who are arguably outplaying him so far in the preseason - three of those guys (Lee, Terry, Sullinger) have never worn a Celtics jersey, and the fourth one (Green) just came back after heart surgery and not playing for an entire year.
Of course comparing him to our starers doesn't make it any better:
Brandon Bass
13.7 Pts (66% FG), 7.4 Reb, 2.1 Ass, 0.3 Stl, 0.3 Blk, 0.8 TO
Paul Pierce
25.1 Pts (52% FG, 58% 3PT), 6.7 Reb, 2.1 Ass, 0.5 Stl, 3.4 TO
Kevin Garnett
14.4 Pts (59% FG), 9.0 Reb, 3.2 Ass, 2.3 Stl, 2.3 Blk, 4.0 TO
Rajon Rondo
13.1 Pts (42% FG, 40% 3PT), 9.8 Ass, 5.3 Reb, 1.4 Stl, 5.3 TO
Basically we have 8 guys on our roster who are performing as well as (or better than) Joe Johnson - a guy who is supposed to be an All-Star and the #2 option in Brooklyn.
The fact that Jason Terry is coming in off the bench and outperforming Joe Johnson in every statistical category on a per minute basis (including rebounding, for a 6'2" combo guard) is a worry.
Even Courtney Lee (who is considered by most to be a borderline starter) has put up numbers at on par with Johnson, while playing far superior defense.
Also when Joe Johnson (one of the biggest SG's in the league) is getting out rebounded by three modestly sized guards (Terry, Lee, Rondo) that's a little...embarassing.
If he's just the type of veteran guys who falls asleep during preseason games and then comes alive when it counts, then I'd understand completely...but his performance in the playoffs last season was even more woeful.
All of this leads me to the conclusion that Joe Johnson is a 'solid' starter at best. Certainly not an All Star.
In fact that's what I've always thought of him...a nice player, but terribly overrated.