I want paid mods. I've got no problem with non-paid mods existing too, but I'd like to have the opportunity to pay to accelerate the rate of content creation.
I've got no problem with people who don't want to buy them, but I think that those people shouldn't take issue with people who do want them.
I think the biggest problem was that the TA mod was for only the second quest for basically a new faction.
There would probably have been less of that sort of reaction if the trackers alliance had a few quests as part of the update and it was added a bit later.