All in all, if you have never played NWN 2 before and want to give CRPGs a try, grab a copy of NWN2 Complete on GoG. The game would be worth its price even for MotB alone. Excellent story with truly epic moments can rival even BG2 and Planescape: Torment. MotB is the best RPG experience Obsidian ever made, hands down. I would like to point out one more thing and that is Mask of the Betrayer. Fighter, rogue and caster classes are all equally fun to play, which is something of a miracle in DnD-based computer CRPGs. Companion banter in OC, MotB and MoW is witty and funny. Every character is unique, RPG system and character development is so good you will feel the urge to advance just-one-more-level before you go to sleep. Whichever campaign you play, whatever race and class you choose, you will have fun. You basically get dozens of games for the price of one. Want both? Grab some of the dozens high-quality fan-made modules from Neverwinter Nexus.
Want a more free-roam experience? Storm of Zehir is for you. Want a good story-driven experience? Play original campaign, Mask of the Betrayer, Mysteries of Westgate. It offers everything to everyone who has at least some inclinations to play RPGs. Now, after nearly 10 years of polishment form both Obsidian and especially fans, NWN 2 is pinnacle of CRPG experience. It was a buggy mess and first half of the campaign scared many players away from this title. I remember my disappointment when NWN 2 first came out. It was a buggy mess and first half of the campaign Ah, the power of re-releases.