Not to mention that Rogue has an upper limit on how much power she can absorb at once.
I've seen her try to powerdrain the Juggernaut and only leech off some of his strength, while he was still conscious and having the majority of his power, because the Juggernaut has a lot of power.
I also saw her try and powerleech Loki once and... well, it was like if she'd knelt down and stuck her tongue on the third rail of a subway. *ZORCH* Rogue was KTFO'ed just from the overload and Loki was laughing it off.
I've seen her try to powerdrain the Juggernaut and only leech off some of his strength, while he was still conscious and having the majority of his power, because the Juggernaut has a lot of power.
I also saw her try and powerleech Loki once and... well, it was like if she'd knelt down and stuck her tongue on the third rail of a subway. *ZORCH* Rogue was KTFO'ed just from the overload and Loki was laughing it off.