Drafting under his tenure wasn't top notch, though the Jays system still rolled out solid players who contributed or were used in future trades to land other assets even under AA's tenure.
Aaron Hill, Adam Lind, Dustin McGowan, Shaun Marcum (turned into Brett Lawrie who was turned into Josh Donaldson), Brandon League (was turned into Brandon Morrow prior to 2010), Brett Cecil, Eric Thames, and Drew Hutchison. Travis Snider was a bust unfortunately, though when coming up there was a lot of hype around him as any prospect in the game. It's unfortunate McGowan couldn't stay healthy because he had some of the best raw stuff I've seen.
In terms of trades and free agent signings, Ricciardi did a great job at finding value and even his big signings/trades turned out well. The Blue Jays always had a solid bullpen. His FO did a great job at evaluating talent. Look at guys he brought in via trade or minor league contracts for the bullpen like Jason Frasor, Scott Downs, Brian Tallet, Justin Speier, Jeremy Accardo, and Pete Walker. If Pete Walker never spent most of playing career with the Blue Jays, who knows if he would be here as the pitching coach right now? In terms of bats, look no further than Jose Bautista when they brought him in from the Pirates. Others include Frank Catalanotto, Marco Scutaro, traded Bobby Kielty for Ted Lilly, Gregg Zaun, and got solid years out of guys who were near the end of the line on one-year contracts like Gregg Myers, Mike Bordick and Matt Stairs haha.
When you look back at the big trades and signings he did, I actually appreciate those moves even more now. After the 2005 season, he had a huge offseason signing AJ Burnett, BJ Ryan, Benjie Molina and trading for Troy Glaus and Lyle Overbay. There was a lot of buzz surrounding the Blue Jays for the first time in a long time. Burnett was a really solid signing and pitched well here especially in 2008 before his opt-out. BJ Ryan was lights out in 2006 and decent in 2008 though yes injuries really made his contract look bad. If he was healthy, he was performing though. Glaus and Overbay were great in their first seasons here. Overbay was never the same after getting hit on the wrists in 2007. He resigned Roy Halladay to a very favorable contract extension to keep him around longer and did leave AA with one of the best trading chips to completely retool the farm system. As much as I hated the Vernon Wells contract, he managed to keep a big name player from leaving Toronto as a free agent at a time when nobody wanted to come play with the Blue Jays. He traded Glaus for Scott Rolen after 2007 and AA turned Rolen into Edwin Encarnacion in 2009. I wish though JP was more aggressive in 2008 in terms of adding solid bats. A lot of ABs were wasted on Shannon Stewart, Brad Wilkerson, Kevin Mench, David Eckstein etc. The team had no real true power threat that season and wasted all that great pitching they had. Losing Marcum and McGowan though to injuries that season and long term did really impact what the Jays were going to do in 2009. I think if the Jays knew they would have had a healthy Marcum and McGowan in 2009, they would have added more in the offseason or went after Burnett harder.