It's the gear modding/crafting system in City of Steam that's currently its biggest strength for me.
Gear mods drop frequently from mobs and chests, and they can be easily and quickly combined with other mods to upgrade them. Mods can also be slotted/unslotted in gear as you go along, and without any penalty or cost. In fact combining and slotting mods is a good way to clear space in your inventory on an extended dungeon crawl by filling gear you plan to sell with any mods you don't want/need.
Many mods can be slotted in several types of gear too, meaning there's a vast choice available to customise according to playstyle.
The game is very much still beta and still has a way to go, but if they keep the current modding system as it is, it's a very strong offering. And the graphics are pretty good - it's easy to forget you're playing a browser game. The Unity engine is serving the dev team rather well so far.
As for the lore, it's based on a very well imagined tabletop RPG - it's easy to see there's a lot of creativity and potential in the whole mechanic of the game's World Machine. Time will tell I guess, but it's certainly got a thumbs up from me so far (my avatar is from CoS btw)
