Is the reason people are struggling with Mammoths etc. because they are on a higher difficulty than me? I'm curious, because the only enemies that I have trouble with (Bearing in mind I haven't advanced the main story so haven't fought any Dragons) is Arch Necromancers, which can pretty much kill me in 3-4 hits (Ice magic too so if they hit me once I can't get close with my shield so i'm pretty much dead). I'm on the default difficulty, but considering how much of a struggle it was at low level I don't see how I could have gone any higher. I think the game just gets easier as you level, which makes a pleasant change from Oblivion which did the exact opposite. I'm currently level 43 (I think) with heavy armour around 90, One handed around 95 and Blocking at around level 75-80.
What is everybodies playing style? I tend to sneak with a bow and then switch to Sword and Shield when things get rough. Shield bash is so useful, it stuns just about anything, including Giants and Mammoths. Step 1: Shield Bash Step 2: 2-3 sword strikes Step 3: Rinse and repeat to kill any enemy. For more awesomeness bash them before they withdraw their weapon and they can never hope to hit you... until you run out of stamina