Full Throttle is one of the weakest LucasArts adventure games, imo, when it comes to gameplay at least. Way too easy, way too short, and some bad gameplay sequences (the road rash puzzle and the destruction derby for example). Typical Tim Schafer game - great story and humour, but lacking in gameplay and/or puzzles.
Of course, being one of the weakest LucasArts adventure games doesn't say a lot, since they're all so great. Only Sam and Max, Maniac Mansion and The Dig are lower on my list.