Sure both trilogies get the same type of criticism, but there's a matter of 'scale'. Lotr also had to content with accussations of changes, but back then Jackson had arguably a lot more restraint and sense when it comes to adapting and most of the changes he made (even the drastic ones) had a lot of sense behind them (like the cutting of Bombadil, or the things done to Faramir). But this time, there are so many alterations and padding, that even though I see the reasoning behind some of them, many of it is hard to defend.
The same goes for accusations of "blockbustery" antics and feel. While I've spend a long post defending probably the most excessive scene of the last two movies, I am not blind to the reasons why people might not like it. LOTR had it too but nowhere near this scale. In Lotr such elements were singular moments, while in case of Hobbit, it's more indicative of the overall tone of the films (though I think that actually fits nicely with adventurous spirit of the book).
Basically LOTR had to contend with the same criticism but most of it back then was a lot easier to defend. This time around, If someone is a person who dislikes PJ attitude, then he's got a lot more ammunition to use. Especially now after DOS which I felt was a culmination and a showcase of all things that some people don't like about his vision of Middle Earth. I just hope I am wrong and it's not as bad as I am making it out to be. And that this trilogy as a whole will leave a less "hollywood'y" impression than DOS left on some.