Some overenthusiastic designers with a penchant for bells and whistles persist in putting crotch straps on the bottom of their waterproof/breathable jackets. Unless you like the chastity belt/straight jacket approach to fashion, avoid these at all costs. Also, if your jacket of choice has a draw cord at the waist, check to make sure it doesn't interfere with the waist belt of your pack. Check the durability of the zippers. Large-tooth zippers seem to hold up better than standard coil zippers. It is interesting that recently, Gore did alter its standards to accommodate new waterproof zipper technology, which is now available on Arc'teryx and Wild Things Jackets.
Also scrutinize the zipper pull and end tangs for reinforcements, since these areas are the most likely points of failure. Look at the cuffs on the coat. Velcro closures here are good, since they can be tightened to seal out water and worn loose for added breathability and comfort. And remember, bring along any and all accouterments you might be wearing with your coat—packs, harnesses, gloves, and secondary layers. Your jacket will ideally be part of a system that will keep you warm, dry, and comfortable, so make sure all components work together to meet that goal.
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