I know this is one of the most hated questions around because it's silly starting a game mid-series, but I tried playing the first, and was ridiculously bored at the combat, so my friend said to just skip to this one. I looked around wiki, and this one has a completely different character from the games in the series, so I wanted to know if it was mandatory to play the rest before this one. And if it is, can someone give me a quick summary on what to know, just a few bullet points or whatever would suffice.
Read summary of AC1, then buy the Ezio Trilogy(includes AC2, ACB, and ACR... which are the order the games came out in). AC1's story is decent enough, but as you said, other things make it boring. AC2 and on are much better.
Besides, the story in these games continue from one to the next, so it's a good idea to play them in order if possible.
2. The AC games have very little relation to each other story wise outside of Desmond. This is mostly because Altair, Ezio, and Connor live so many years apart from each other. Even still, the Ezio games hardly have any relation. He's just older in each one. If you plan to understand Desmond's story though, yeah, you'll want to play them all. Otherwise, they're fine as stand alone games.
PSN: KazuoMitarashi / Currently Playing: AC3 (4th Prestige), Borderlands 2 (Siren), DmC, SSBB, Zelda, Halo 4, and FE: Awakening