I completely agree with Raven on that, the Dark Matter Models are nicely made and textured, but the animations aren't very good, there's not very many of them (Jump animations for example? A RANGE of attacks? Plus Crouching, climbing, running, tiptoeing etc all seem pretty basic for action games) and the animations are often not particularly lifelike or useable. BUT they are modelled and textured very well, with good polycounts, and compared to some places, its a very reasonable price indeed
Personally for future model packs I would have thought a complete range of models on a theme would be very useful, for example a wide range of characters, weapons, scenery, vehicles, buildings and textures for a particular theme like war, jungle, egyptian, urban, space, fantasy etc.
Then people could decide what type of game they were interested in making, and have a complete resource available for them for making that game.
Probably the only type of full game realistically makable with Dark Matter 1 was a late 20th/early 21st cenury War game, as this was the only genre with an expansive set of models.
An urban game would be close to replicable, but I don't think there was a wide enough range of vehicles or characters to make it fully possible.
Some of the others were great, for example the Ninja, but had no real other models in the pack to fit with it (Other oriental models, weapons and characters?)
BUT like I said, for the price the models are well made and well textured, and reasonably priced.
Personally high on my list of things to release would be an explosion pack, and a sound effects resourse.
(BTW I'm working on similar things myself, but I thought I'd give some advice on possible ideas you may want to use in the future

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Quikly Studio Pro. Soon. Honest.