Re flavor - this is what fruit eliquid vapor will taste like: sweet or sweet&sour. That is it. And food is exactly the same. The reason is your tongue can only taste sweet, sour, salty, bitter, and umami (savory/MSG). If you don't smell it, a piece of apple will taste identical to a piece of sweet onion. You have to smell the vapor to complete the flavor. An apple liquid puts some hopefully suitable amount of sweet and sour on the tongue, but it is not apple until you smell it.
VG can dull the flavor and add more sweetness. I use high PG juices for good flavor and hit.
Heat can dull flavor - often cooler attys/cartos can deliver flavor better. Heat delivers hit better.
High nicotine can overpower flavor with its peppery effect.
Atomizers - I hate them. They degrade, the coil gets coated with baked on stuff, and everything loses its flavor. I use cartomizers for my main juices. If 7-10 days later the carto gets weak flavor and vapor, you toss it and start a fresh one.
Vaping the same or similar flavor over and over will make you not taste it. I alternate 2 contrasting flavors. one very sweet and one smoky and not sweet. Each refreshes my taste fo the other.