I loved Halo 4. I was disappointed with Halo 3: ODST and I didn't even bother with Halo: Reach, so I was really glad that Halo 4's campaign was so good. I couldn't put it down.
I bought the last two map packs for it on multi, but I haven't had a chance to get together with my friends and have a Halo night. I can't wait though, because the multi is also solid.