Graphics: 4/5 A step down from the core GTA IV game - only because there's an unnecessary film grain added in by Rockstar. Thankfully, it can be turned off. ( Go into the menu and turn "Noise Effect" off. )
Sound: 5/5 Better than the main game. The voice acting is great as usually, with some funny moments, the TV shows are funny, and the Liberty Rock songs are ace. "Funk #49", "Highway Star", "Run to the Hills", "Renegade", etc. Songs from the disc version of the game are also mixed in, and these songs can be heard on the radio even when you go back to Niko's story. Niceee.
Control: 4/5 To be honest, I don't like it much. Rockstar changed up the bike controls a bit to make them easier to control for the noobies and even more skilled players. I don't like it at all, mainly because on turns the bikes tend to spin out, when they never used to before. Also, it's harder to fall off your bike - you basically have to go top speed head-on into a wall or car to fall off.
Fun: 4.25/5 A great value at $20, but there are some issues. First, Johnny isn't exactly what you'd call a "likable" character. Niko was a naughty boy himself but Johnny is just... a dick - you'll know what I mean if you download TLaD. ( Which you should. ) The story doesn't suck you in a BUNCH, and the gang wars and races, while fun at first, are really just repetitive - especially if you play them a lot. The multiplayer is okay, but some modes ( Like Lone Biker ) throw you in the same starting point every round. It is definitely fun, but WHY the same spot? And finally - the weapons. The "mini-shotgun" as I call it and grenade launchers are great - it's just a shame they can't be used outisde of TLaD. Anyways yadda, yadda, yadda, TLaD is a good deal at $20 - despite there being a fully nude... guy. ( Yes, a penis. We see a penis. ) and there are a few pretty easy achievements. All you really have to do is beat the story and by then you'll have 250 achievement points. Did I mention the story was 10 hours or so long? And this DLC only costs $20? What are you waiting for exactly?