I don't think there's any other way to describe the single-player mode in this game. In theory an extended tutorial for a very complicated game, Guilty Gear 2 kind of forgets to teach you how to play the game about halfway through in favor of some strange, memorable setpieces, ranging from the 2D overhead shooter level (I shit you not) to the finale, which appears to have been ripped directly from Sonic Adventure. Don't ask me, man. Campaign mode is quite a ride, but when you're done you still have no idea how to play Guilty Gear 2. This is only one of its flaws.
The other really big problem with the story mode is, well, its story. GG2 has a lot of cutscenes: so many, in fact, that some missions consist only of a cutscene, which must be watched or skipped in order to proceed. The presence of opening credits over and early cutscene suggests that this is some kind of cinematic presentation, but the direction is limited to the camera standing idly by while talking heads prattle on and on. Most of the discussion is inane technobabble-- this chord isn't anything like the magic i've seen before, I've got to rewrite the circuit so we can tune the frequency and break the barrier-- and as a result of the poor storytelling, the whole mode is a serious drag to sit through. There are some tidbits for GG fans, but nothing significant really happens, and (SPOILERS FOR A SURPRISE TO NOBODY) the game ends with a "to be continued".
Should I go ahead and make note of the voices here? The US release is happily bilingual, with an English dub provided by the usual anime dubbing suspects. On the Japanese side, Jouji Nakata of Hellsing fame plays Sol. One big problem that both audio tracks have is the extreme repetition of lines. Arc was always good with this problem in their fighting games: characters would have random voice sets that kept you from hearing VORCANIC VAIPA the same way over and over again. They kind of forgot to do that in this game. If you're playing Sol one really annoying part comes to mind: on the second hit of his normal 3-hit combo, Sol yells SHUT UP. English or Japanese, he says SHUT UP. He says it every time. He also does it when you press a direction + attack.
SHUT UP. SHUT UP. SHUT UP. SHUT UP. Sometimes when they were talking about unusual magical time signatures during the cutscenes, I'd think of SHUT UP, over and over again. You really do understand my feelings, Frederick.