As companies, they all suck. Not trying to be dramatic, and not saying there cars suck. There old, there mired in debt, there are far too many. They for the most part make the same thing as everyone else. The industry will either need to consolidate or loose a few. This is why you see the various "alliances". They have spent the last decade borrowing money to buy back shares as their strategy. Maybe the best of the bunch as a company is Toyota - but there still mired in debt, and still make a civic and Rav4 over and over.
I really have no idea of how to value Tesla. There isn't enough history. What is the projected growth rate of EV's? Can they even hold grow or even hold steady? They need new products - not just for interest, but because there current product is a too expensive. If they ever got the self driving thing to work, thats a game changer. But I don't think that will happen in my lifetime. So who knows?