I think if anything AC, Watchdogs, and Far Cry show more consistency. Yeah AC3 was a step back but AC IV really got the series on teh right track. I don't know. I just find their games more consistently appealing. I also actually enjoyed sleeping dogs more than GTA in a lot of ways. The gameplay to me was just more fun. Yes GTA still has random things you can do like throwing grenades at the golf course which you can't really do in other games and pedestrians react in funny ways especialy in GTA V, but while GTA is adding these stupid mini games, AC IV is adding a more conistent world and game that's more addictive to play imo. I feel like Watch Dogs will be the same way. GTA is a fun game to mess around with but it's story is really not that appealing to a lot of people. Red Dead was probably the most consistant game Rockstar came up with last gen. People say they want uncharted in an open world. Ubisoft has basically delivered that or pirates of the carribean with AC IV imo.... I think the fact it actually has combat and different styles of it and exploration tied around an appealing set of characters and story is a plus in and of itself.
None of these games are the end all be all but as far as a huge open world adventure games go with action and fun gameplay, upgrades a working economy, mixed with story and exploration I think Ubisoft has the best balance. IT's at least nice to see there is a choice between rockstar, ubisoft, some of these superhero games and games like Skyrim and FAllout. Square is also doing some interesting things too. We need more detective games imo like LA Noire with better gameplay more mature story and adventure elements but not sure that will ever happen. In the meantime I'm enjoying ubisoft's games the most.
I think as of right now ACIV is the best game ever created and might be more a long time. I've had the most enjoyment with it. It's addictive, immersive and fun to play. It's pirates for god's sake. Watch Dogs is coming. Will Rockstar ever release agent? Who knows.
Ubisoft doesn't get teh same hype but I think they are on that same level and have surpassed Rockstar in a lot of ways.