No it doesn't. We are all talking about the lucasArts mercenaries right? In that game I can't change the radio station, visit houses, have police chase after me based on my choices, walk from one end of gigantic city (sandbox to the other), pick up a hooker, drive a cop car, put out fires, need I go on?
Getting into a vehicle and blowing shit up does not mean its a GTA clone. GTA was not the first to do this and surely not the last. Does that mean Mercs is a completely different type of game? No, but clearly it is not a clone and neither is DAH. In fact if you look at it from the reverse side, its even more clear how wrong the "clone" statement is. Does GTA have mutliple characters? Can you call in backup/support? Can you even destroy one single building in any of the GTA? Does GTA have deformable environments?
OP: Wait for DAH to drop, grab mercs for now. DAH will hit 39 in a month or two and probably drop to 29 in 6 months anyway. Save your money and grab Mercs and run around as either Han or Indy (depending on the system you get it for). It is a great game for sure, where as the jury is still out on the long-term playability of DAH.