Jeffro: I know D2 is a 3rd person rpg similar to Two Worlds, Risen, The Witcher, etc. I'm just wondering if it's as deep as the original and is the charm and comedy from DD present?
It is still as deep as DD in terms of character mechanics and roleplaying possibilities, and the whimsical Larian humour is stronger than ever (especially with the addition of the mind reading mechanic). I had my doubts as to how D2 would hold up to its predecessor since the engine is so different, but the original DD spirit is intact, and I've loved D2 from beginning to end.
Jeffro: Also, do they have any story bits in common?
Yes. D2 is a sequel to DD, although quite some time has passed (I must admit I don't actually remember any specifics like dates at this point, I've played DD waaaay long ago). The story link between the two games doesn't drive new comers away, though: you'll be provided with background throughout the game through various sources. I've played D2 with only a vague recollection of DD's plot, and I felt pleasantly at home with the familiar setting and background without being lost because I've forgotten some of the previous story.
Major characters from DD do come back, in a significant way, and this *is* a continuation of DD's story.
Jeffro: I'm about to finish DD, but I've had enough 2D crpg for now and I'm gonna skip Beyond Divinity for some other time.
I've actually never played through Beyond Divinity, to be honest. Couldn't really get into it, for some reason. This wasn't at all detrimental to my enjoyment of D2, since it ties in with DD very smoothly story-wise, like I mentioned above.
If you're still unsure about whether you should buy D2, I heartily recommend that you play it. You really won't regret it, especially since it has been polished to a shine with its update and expansion. :)