It's an indictment of the starting WR who finishes the year with 24 receptions.
2003: Branch, Givens, and Brown all had more receiving yards than Faulk did
2004: Givens, Patten, and Branch all had more yards (as did Graham)
2005: Branch, Givens, Brown, and Dwight (and Watson) had more yards than Faulk.
A starting WR managing 24 catches over a full season is unprecedented in the Belichick era. Being sixth on the team in receptions with the same qualifiers is also unprecedented. Of the five guys ahead of him, three were in their first year on the team, and two were rookies altogether. You folks can claim that it was because he was buried on the depth chart all that you want, but at no point in the season were we swimming in WR talent. What he ostensibly is--an edge receiver who can stretch the field and beat single coverage--is exactly what we were lacking, and lacking that might be the single biggest reason why we lost to the Jets in the playoffs. If he was a good player, the team would have looked to him more, because they needed him. But they didn't, because in 2010 he simply wasn't a good receiver.
To this point in his career, it's self-evident that Tate is not a good WR. He might become one, and I hope that he does- as far as I'm aware, nobody on this thread has said that it won't or can't happen. We're all Pats fans, and we're all rooting for him. But acting like his progress to date is normal and fine and not something to be concerned about is pure, blind homerism. Hopefully he can pull it all together and become a solid WR option. Even if not, he's still a good KR, so hopefully some combination of Taylor Price and a FA WR can do the job instead.
In either case, it's a simple fact that Tate has not produced to date, and, compared to other guys in his draft class and other Patriots who are younger than he is, there isn't a whole lot to be encouraged about. Hopefully that will change this year, but we haven't seen much of anything from him on the field to indicate that that will happen... yet.
Honestly, I think this whole debate is indicative of two different ways of looking at young Pats players: there's a camp that assumes that they will be good until they've definitely proven that they won't/can't be, and there's another camp that will assume nothing that they haven't already shown the capacity to do. The former tends to overestimate players, and the latter tends to underestimate them. The difference, especially when you're talking about, for example, a 3rd round pick with a pretty devastating injury history, is that players in that position are far more likely to wash out than become productive NFL starters. Just on odds alone, the latter camp is far more likely to be correct, and that's exactly why we see things the way that we do. I'll believe that Tate is capable of being a solid NFL starter the day that he shows on the field that he is physically and mentally capable of it. Until then, I'll hope for the best and assume nothing.