Angles are very important. If you absolutely can't take it at an angle, just grit your teeth and go slow. There's also rubber ramps like someone posted. I talked to the people from Bridjit at SEMA last year and they assured me that they've never heard of an HOA complaint because of their product, if that matters to you.
Bridjit Curb Ramps - The No Jar To Your Car Curb Solution
Until you're as low as Calvin, you're not havin' problems!
More photos here:
Calvin's 370z Journal