Dragon Age Origins.
Why: it was free for some time about a month ago.
DLCs: actually I managed to get most of them free as well, except for Awakening. DLC are .dazips and install as any other mod.
EDIT: nope, they show up as active and installed but most of them turn out to be not-working.
Mods: Come in as overrides and .dazips.There is a nice tool for installing them made by Bioware and another better tool by community. It even shows you when there are conflicts. You would think it is great, but not so much. Because conflicts exist even between 2 files in one project. Next thing is that one override causes 5 other to break. Another thing is that override might not be compatible with dazips and it won't show until you reach the bug in game. Dao community does not want to make things work with each other apparently*.
Modules: same as above about installation. Haven't tried them yet, but they already managed to break my loading screen. If anyone liked Rose of Eternity series with their overmarketing then the 3rd part was just released in DAO toolset. Perfect timing '>
Override: I just want to mention it allows to have files in folders unlike NWN.
Classes: 3 whole classes! With 4 specializations each! Specialization is like 1/10th of a class though. So according to my calcs 4.2 classes. Not much. Also 75% of enemies fall into these classes as well. They do have some monster-only skills, but well.
Enemies: can't check their classes, nor any difficulty rating(except that bosses are yellow-red). This is annoying when you think that mob with casting powers should have some mana for you to steal and it has only stamina..
Romances: You can fully romance and sleep with companions once you reach the camp 2nd time. Just buy the +50 approval gifts. No sweet talkin', no build-up meh. Then I installed "Polyamory" to get all romances in one playthrough. Nope, incompatible with bugfixes.
RPG/HnS: well game is real time with active pause and all battles require tactics especially at harder levels. You can set AI with several IF THEN commands disguised in a menu, otherwise your party will be dumb or you will have to control all characters at once. During pause you can set only one action in queue. As to whether there is rpg or not: it feels like "adult" bloody** rpg, with choices, some of which are even meaningful.
TAB - highlights items and while in NWN invisible placeables are rare... in DAO you encounter i.e. "pile of rocks" that is only visible with TAB Non lootable objects generally.
Origins: how nice I can play 6 different prologues! Yay! How creative. Then I found out that they reuse most of the areas from those origins. Anyway played a mage concentrating on healing.
Toolset: Haven't opened it and never will.
Plot: nothing new I guess.
Party: I chose 2 mages (me & Morrigan), warrior (allistair), rogue (leliana) + mabari (doge). Shame you can't take all of them on missions. There is party campsite and random encounters and bickering and world map.
*with some exceptions
**that's sarcasm, DAO marketing with all the blood(dragon made of blood, duh) was the thing that made me NOT buy it when it came out.
PS: Sorry Tarot.