I'd like to think I care about the lore as much as anyone. However, I can accept most of the additions in the game for two reasons.
First, just as in the movies (which I enjoyed in spite of their flaws and odd alterations from the books), some changes are made to accommodate the medium. Sapience has presented that point of view very clearly above.
Second, there are many, many people, places, and phenomena in Arda that never made it into the Red Book which, after all, reflected the experience and viewpoint of the five hobbit adventurers. Who is to say that there was no Trestlebridge in the 'real' Middle-earth, for example. The hobbits never made it to the North Downs area, so anything Turbine fictionalizes there is fair game, if it is consistent with lore. Similarly, perhaps there were visitors on various errands to Lothlorien who never came to the hobbits' atttention. And so on.
It is my view, for what it's worth, that we can love the lore and appreciate the huge number of ways that Turbine has realized it, and at the same time be somewhat flexible about some game-driven changes and the fact that if something wasn't mentioned in Tolkien's works, that doesn't mean that it couldn't have existed.
Alasse: lore-master 100 on Landroval, plus alts of every other class