I don't think Elsom has been widely criticised - maybe just on the occassions he has had a below average game (the Brumbies have every chance of making the finals now, but there were some dark days earlier in the season). My memory of the G&GR player of the match points is that he has featured pretty often.
The main discussion about Elsom has been whether (although he is clearly the 1st choice 6) he could play at number 8 in place of the injured Palu, as there is better depth at 6 than at 8 for the Wallabies...so in effect many people (me included) think that in the abscence of Palu, Elsom is the best option for two positions (6 and 8).
As for comparing TPN and Elsom - I don't think so. The reason TPN has been praised so widely is that he does all the stuff you mention whilst playing at hooker (and he doesn't 'tackle' - he smashes suckas, also his runs are almost always into heavy defence). For me they are the first choice for their positions.
Moore had an excellent game against the Highlanders, and he has been very good for most of the season, but the only area in which he is ahead of TPN is line out throwing (and that is only just). I am very happy that the Wallabies have such talent to choose from (and before anyone even suggests it - S Fainga'a is no where near these guys, but maybe in time he will be).