I don't understand the negativity. They're going to listen to the community, and the community knows UT3 sucked and 2k4/99 were good. People CAN charge for mods, but there are going to be TONS of people who will make maps/mods for free.
It's PC only. It's not F2P, it's free. Imagine Dota 2. The base game is entirely free, no paywall through microtransactions at all. Except people will make and distribute mods/maps for free. Some will charge, and if their stuff is good enough, they will make some money (and deservedly so).
Epic is going to make their money by taking a cut of the mod/maps that are sold, and also they're creating a huge user base of UE4. By creating such a large user base, they increase the amount of games made with UE4, which they will take a 5% cut of.
For those with such a negative view, can you explain why?
There are going to be maps/modes in the basic game. There will be TONS of free content.