Big Bang Board Games (thoughtfully bundled full-version - thanks Apple) had never ran well on the MacBook. The rest of the computer would scream, but when running that it would just freeze in a minor fit whenever I placed or moved a piece. The movement was choppy. There was also the thing about QuickTime not working very well with H.264 or other MPEG-4-based movies (white screens, no audio).
Whether the problem came by my using the Migration Assistant (and somehow corrupting something - although I had removed all third-party components) or it being a bug in Intel QuickTime builds (the movies played back fine in Rosetta) I may never know. However, I do know that after installing Mac OS X 10.4.7 and QuickTime 7.1.2, the problem disappeared, Ze Frank audible and BBBG playable.
I’m slowly coming off the “everything’s roses” phase you acquire with any decent apparatus in the start. However, I firmly stand by my opinion that the MacBook is an incredibly solid, well-built machine, and I have since discovered that its speed (the primary reason for me buying it) is something to shout about. (Encoding movies, in particular, is very, very, very fast in comparison to the old PowerBook.)