The sequence he's describing is timed, but most of the campaign game isn't (the timed tutorial sequence just gives the player a suggested Difficulty Level to play at) so in this case, the training sequence really doesn't indicate how he's going to do during the campaign.
I think I failed that one a couple of times myself.
I feel for him -- for me my "stuck point" like that was in the dreadful "on the battleship Arizona" sequence in Medal of Honor: Pacific Assault
. I mean, I spent $50 on a game to get Pacific theater combat, not to run around a sinking battleship turning valves and opening/closing bulkhead doors, and ultimately not being able to do so fast enough (actually I couldn't even understand what to do on that level, it wasn't spelled out nearly clearly enough).
A friend later pointed me to a site where you could download MOH: PA savegames that started just after the Arizona sequence -- the fact people were demanding something like that so much told me lots of other players were just as expaserated by it.
Part of the reason I slogged through the very end of MOH: Airborne was the lingering memory of never getting past that "stuck" point in MOH: PA (I never did install the savegames, I just bagged the game).