Welch's concord is easy and a great way to get started. If some very rare unfortunate incident should cause it somehow to go bad, you are not out big bucks. I don't know about the flavor complaint, I have had some very fine Welch's by manipulating the back end of it before bottling. I do like that it provides a decent base to play around with, and generally it's well under $2 a bottle when you are all done. My results from fiddling have run from bold and biting to very mellow and dessert-like.
After your first experience with it, you may wish to move to a "higher class" wine, but there are folks on here who never stop making the Welch's as an everyday wine, to keep them out of their high-class stuff as it ages.
For me personally, starting with Welch's made me realize I could make my own wine without the need for a kit, it got me hooked on the experimental art of manipulating the wine rather than following directions, and consequently I never have made a kit.
Your mileage may vary. Have fun with it!