Most "drum synth" plugins (vst intruments) will sound exactly as the name implies -synthy. Drum machine ones such as the LM7 that comes with Cubase aren't a whole lot better, but you can use the included one to get some decent sounds for free.
What I would suggest to get a more organic and natural sound using MIDI to sequence would be to get some type of VST sampler. I like the ones from Native Instruments the best. They make one called "Battery" that is designed to be used for drum sequencing. You could also look into their flagship Kontakt if you want to do other types of sampling.
Sampling is much more flexible, because you can record and tweak your own sounds, and then record the midi information to sequence...this is assuming you have access to recording equipment to create your own samples. However, there is also a wealth of samples you can download or purchase.