I think JK had cheeseball cutscenes with bad acting. For the time and money I guess the compositing was ok, but they could have spent more time on the texturing of the sets and characters that were cg at least.
The problem with ingame cutscenes of the past have sometimes been things like camera shots all over the place, breaking the 180 degree rule, bad character animation...blah blah blah. Recent games are getting a lot better at this however.
An example of recent games with cutscenes in the JK style would be mech warrior 4. It had live actors with cg backgrounds, maybe the demo would be worth checking out.