Great game!  If you have fond memories of playing Ultima III-V, you will love this one.  You'll explore a large world (both over and under ground), fight a lot of monsters, find powerful artifacts for your party, and maybe even encounter a major plot twist!

The game allows for full party creation right from the start, and uses a character creation system based on skill points.  Each character has a set of attributes (that mostly provide bonuses in combat) and a set of skills (which mostly determine your success at melee or ranged combat, disarming traps, casting spells, or playing music).

A large part of the game involves exploring the land and talking to NPCs in town to gather crucial information.  Most hints are provided by multiple NPCs, so you won't get stuck even if you miss someone here or there.

You'll also equip your characters in town.  Lurking has an impressive array of weapons, armor, and equipment for you to purchase.  The game is somewhat stingy with handing out gold, so you'll plenty of stuff on which to spend gold even at the very end of the game.

And you'll need to keep up on upgrading your equipment, because combat starts out quit challenging and only becomes easy toward the very end of the game.  Enemies are tough, but are not damage sponges and can usually be killed with an attack or two.  Spellcasters should be given a few points in the RANGED skill so that they can help out in battle early on (and earn EXP) before you start finding the more powerful combat spells.

Once you've explored much of the land, you'll start exploring the dungeons.  The game really excels here.  In addition to smaller dungeons littering the surface of the world, you have a giant megadungeon with multiple entrances.  You'll need to explore all of these to complete the game, but they would be worth exploring anyway because they are full of caches of powerful equipment.  Magic equipment is almost always worth seeking out, as this equipment is almost always a clear upgrade over the stuff you can buy in towns.

Overall, simply a fantastic game.  I'd reckon it took 25-30 hours to complete, but I had taken good notes and didn't get lost very often.  If you love Ultima III-V, or classic CRPGs in general, definitely give Lurking a try!