Gaming question: Free-to-play browser-based ARPGs

This question might be more applicable to TAY; if anyone wants to share it over there, I'd appreciate it!

I am a PC gamer. I have some distant friends who I like to game with, and the last major game we played through was Torchlight 2. It was kind of a pain in the arse to play that game, because one of my friends is primarily a Mac user. Using this resource, I see a few options of ARPGs that are free to play, accessible to Mac, and not a lame demo (with apologies to Diablo 3). The few options being:

1 Drakensang Online
2 Kings Road

Does anyone have any opinions on either of those two games, or suggestions for others? I'm looking for casual games that are accessible to Mac, multiplayer, preferably with hack-and-slash elements. LOTRO is maybe an option, can anyone who has it installed currently give a hard drive space estimate?