So it's like low budget Blackguards 1?
Since I'm finishing my 2nd playtrough of Blackguards and I finished DR like 4 times or so, I think I'm in a good position to answer that. If by "low budget" you mean "muh production values", then sure. BG is fully voiced, has pretty graphix etc. But when simply comparing both "combat games", I would say DR is superior in some ways, inferior in others. For example, the character development in BG seems to be deeper, but...not really. BG is plagued by a plethora of trap choices and the actually viable skills/spells/weapons are actually not that many. OTOH, I can't really think of a "trap" choice of weapon is DR. Every weapon has something going on for it and some players will swear that X weapon is better than Y, while others will say "LOLOLOL, Y IS OBVIOUSLY BETTER U SCRUB!". On top of that, weapons in DR actually play out differently from each other, whereas BG weapons are mostly same-ish. Swords are bad axes/maces, two handed swords and two handed bashing are p. much the same, spears are different (but subpar because no Hammer Blow) and xbows are simply bad bows. And as someone already said, and Roxor hinted on his review, archer-mage is pretty much the "optimal" MC. Anything different is subpar and god help you if you decide you want to be a mage. So from a metagame perspective, I would say DR did a better job in giving the player more freedom to play his MC however he wishes. DR/AoD are a great lesson in how the whole "asymmetrical balance" thing should be done.
What BG does better is its encounter design that keeps providing new and interesting challenges that prevent the player from going "auto pilot" on fights. In terms of encounter variety and how interesting these encounters are, I would say BG wins easily. Sometimes it's a straight up fight, others you have to avoid traps and some times you can use the enviroment to your advantage. This is not without flaw, ofc, as I'm pretty sure some fights in BG were not balanced around Hard difficulty (since Hard seems to be simple damage bloat, XP nerf and HP bloat). I'll elaborate on that in the BG thread. I would also say that BG wins on the "story" front, for what is worth. It should also be noted that BG is a much longer game, and it is pretty long without resorting to filler (well, except at the very end. Fuck the Eternal Valley caves with filler fights against spiders).
All in all, I think both games draw their strengths from their way-above-average encounter designs, with BG being a more "great things mixed with shitty things" type of game while DR feels more "pretty good all around".
what's the replayability factor? Is it good the 2nd and 3rd time you play it?
Although there are 4 endings, 2 of them CHA locked, replayability in DR mostly boils down to "do you want to try a different build?". I find experimenting with different builds and comparing the results to be a lot of fun, so I consider the game to have decent replayability value. OTOH, it does NOT have AoD levels of replayability, simply because there are no real "forks in the road" for you to choose.