Nothing wrong with that. The sidequests can be pretty fun.
It just seemed to surprise you that someone finished the game and was level 60, while you've only completed one storyline and you're level 53, and I wanted to clarify how you level up, since it makes more sense when you know that really, level has almost nothing to do with quests (some raise a skill level on completion, so I won't say completely nothing).
Like I said, I did what was comfortable for me, and I completed all the quests probably around level 40-45. To get the level 50 achievement, I had to grind Smithing. And, I'm currently grinding to reach lv70-80 for the Legendary Dragon achievement (I think I'm at level 68 or 69 now).
Currently working on
...100%: Dead or Alive Xtreme 2
...boosting: Soulcalibur V
...personal completion: Sims 3 (got 100% achievements. Working on completing all Challenges)