With 3 kids under 10, few would venture to an MLB game, but Coors Field makes it easy for us. There is plenty of parking in the main lot, private lots and on the street within just 5 blocks in any direction. As another reviewer pointed out, Denver's light rail means not having to park dowtown at all if you'd rather not. The streets outside the stadium are pedestrian-only during games, so there's plenty of walking space. Same goes for the concourse inside - nice and wide for less congestion with an enormous souvenir store on the first base side of the main level. Going in they only check you for weapons and glass bottles; Coors is one of the few venues where you can bring in your own food and drink. (The concessions are the high ballpark prices you 'd expect.) There's not a bad seat in the place, and there are plenty of escalators and elevators if your seats are higher up. If you do find yourself on the third level, your view of the city or mountains is phenomenal, and the Colorado sunset is second to none. When you go, check out the single row of purple seats exactly one mile above sea level. For the kids there is a playground out past left field and there are both batting and pitching cages in center. There are plenty of places to explore in case of rain or kids who need to get up and move around. (Rockies games are rarely rained out.) Coors Field is the best - Go Rockies!
Pros: Architecture, Accessibility, Bring your own food inside, Kid friendly, Scenery
Cons: Premium seating is pricey. Denver's high elevation means afternoon sunburn.