I'm a big believer in per-minute numbers, but only up to a point. Guys that are playing 15 minutes per game or fewer really get their numbers skewed because they are so often playing against backups and/or playing only in garbage time. I would pretty much disregard any of these rookies playing 16 minutes or less.
With that in mind, Beal looks considerably better, ranking 8th behind only Drummond, Davis, Kidd-Gilchrist, Lillard, Sullinger, Valanciunas, and Barnes. Beal has been coming on strong lately. If he keeps it up, I'd like to see a new study utilizing only January numbers. My guess is Beal would rank in the top 4 or 5.
From my own, completely unscientific observations, ranking recent play more heavily than play in November and early December, I'd say Beal is somewhere between the 4th and 6th best rookie, behind Lilliard, Drummond and Davis, and somewhere among Kidd Gilchrist, Sullinger and Valanciunas. Given the respective ages and experience of all players mentioned, the only player who I might potentially regret not drafting at #3 is Drummond.