Getting 28g up to 1.5ohm means a lot of wire, too much wire for standard battery voltage. You are going to need a vv/vw device to properly fire that build, as your power-to-surface area ratio is way off. Too much surface area, not enough power, means too cold a coil. Resistance is NOT the most important factor here, it's surface area vs power available. Too much power for the surface area, you burn juice. Not enough, you don't vaporize properly.
If you are going to be using this on an eGo battery, stick with 32g. It will heat up much quicker for the same resistance as a thicker wire. I suspect your coil is just never reaching optimum temperature, which accounts for the lack of flavor.
It's hard to tell from the pics, but as others mentioned the wick looks a bit choked. Getting that sorted will improve your vape a bit, but the main issue I see here is the wrong wire for your setup.
If people don't think RDAs give superior flavor, they have just never tried a properly built one. If I suck at driving, and do a slow lap in a supercar, that doesn't mean the car is crap, it means I'm a crap driver