I know what you mean. I purposely left BioShock 2 alone seeing as I've only manage 2 hours of it and knew it was unrelated to Infinite and didn't want burn out. You'll be alright in a day or 2 if not getting wasted for your bday might kill off enough of your memory of the previous to reinvigorate your hype.
I will drink myself into a coma! the hype is almost at critical mass. fuck.
...I'll get around to Infinite one of these years when my backlog isn't staring me down.