I honestly had fun with AC1, I pulled an all-nighter to beat it cause I heard AC2 was so much better. Just don't worry about sidequests or anything and do everything you can to beat it ASAP. Like foolmo said, AC2 is even better after having played AC1. And even though getting to the ending scenes means playing through the game, I do think it's worth it. At the very least, play through the first 3 assassinations of AC1, then watch the endgame stuff on youtube.
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~Peaf~
"Later that day, I f***ed a panda." - PSO