After 5 months of constant effort, I evolved my 6* sea dragons to get a 7* Ultimate sea!
By constant effort, I mean getting most of dragons in the levels (as the prize to complete those chapter levels) , buying any baby dragon in the shop and drudgery efforts to level them up to 20, preparing all the material required for all evolutions (getting a few 4* dragons through gem recruit was sad but at least helpful in this process!)
Anyways, after this much of pain and patience, the only good side is the low CP (command point).
They are lot weaker to almost any card in the same star level.
For example, you have to wait 25 turns to get the shoot around 25K much weaker compared to a 7* panzer, around 30K every 9 turn. (Even 6* demon shooter may be preferred over a 7* dragon in many cases)
Also no hope for leveling their skill up with the high rarity of 5* styrs (I haven't seen even a skill level 2 out 16 yet!)
But the most painful of all, since beginning of the game, my 4* dragon was not my best card... by the time I evolved it to 5*, I had much better 5* cards and this dragon almost never fit in my teams. The same story for 6* and now that I have evolve it to 7*, I already have 2 panzers, 3 apocalypses and my 7* HP, Warrior queen, Priestess of Light and m other 7* cards more favorable.
And lastly, they are not good even in Arena!
Please share your thoughts and experiences around these normal dragons, this also could be beneficial to new player who may want to the trade off between the time and effort they may want to put for dragons.
I hope that, playmage (design team) create better and more efficient ways to level the skill of these dragons.