There are lots of better love songs out there, but this has always been my favorite. The best part is near the end in the background when you can hear the lines "Don't know/don't care/all I know is you can take me there! Take me there! Take me there!....etc." Yeah, this isn't really an upbeat/happy kind of love song, but there's some sort of depth to it that a lot of their other songs don't have. The live versions usually have great guitar bits at the end, too.
Oasis - Slide Away - YouTube
If I had to pick one other song, it would have to be Beginnings by Chicago. Totally different music but great nonetheless.