I was a victim of level-scaling with my level 30 melee/magic hybrid which was a bit of everything... he was almost completely useless with the level-scaling due to my lack of understanding of the level-scaling system and poor decision-making. I could barely kill anything although I was apparently an EPIC HERO!
I made a new pure mage character now and he's level 10 and is soo powerful and loving it. However, paranoia has set in lol.. I die a little inside whenever the following happen;
1) Reading a skill book to find it ranks up a skill I never use increasing my level - any chance we could be advised before reading what it ranks up?
2) Selling/buying things and my speech skill increases
3) FAILING lockpicks and the skill still increases!
4) Disenchanting an item and the monsters in the world get stronger
Essential any skill rank up that its not related to combat proficiencies or smithing/enchanting..
However, although I believe the above are poor design I made the most stupid mistakes.
1) Being a jack-of-all trades - spreading myself so thin I was not amazing at anything and the bandits at level 30 were uber powerful often 2-3 shotting me...
2) TRAINING with any trainer that was teaching skills unrelated to what I wanted in order to rank to a higher level... this was a big mistake! I was ranking up pickpocket, alchemy, archery and others which I never used just to rank up! REALLY STUPID don't do it. I went up several levels doing this and on top of all the above made me weaker.
3) Putting perks into giving you more recharge in soul gems and recharging when killing enemies. No NEED for these as there are millions of soul gems everywhere! That was another waste of a few levels.
Thats me done!