Celtics are up 2-0 in the first round. There's no indication that the trade didn't work.
The reality is that anti-trade people use two large assumptions as major points for why they are against the trade.
1) that this team was a championship favorite with Perkins and that the recent average-ish play is a result of missing Perkins.
2) that inexpensive and effective alternatives were available at the backup 2-3 spots.
I think in both cases those assumptions are untrue. I think that this team performed at a ridiculously high and unsustainable level early in the season with Rondo, Ray, Paul and Shaq playing extraordinarily well. The absence of Shaq and the fall back to the norm for Ray-Paul and to some extent Rondo has been the bigger reason for the less the stellar play of late. Secondly, Perkins IS not the Perkins of last year and frankly his impact RIGHT NOW is overstated.
In terms of point 2 I don't think that the Celtics could've realistically acquired a single player that Doc would've trusted enough to play ANY minutes behind Ray and Paul. With Doc showing no trust in Wafer and Sasha and with Parker NOT being moved there were no realistic options to improve that spot. Jeff Green has had two subpar games. I guarantee he'll play better in the upcoming games and his impact will be felt.