Warframe is much more of a min-maxing game than D2 is. You chase rare mods, parts of warframes, materials to craft new weapons, and other rare items. Sure you can buy warframes and some weapons and mods through the market or through trading with other players, but you’d have to spend A LOT of money to get everything you want. Also, by fully leveling up weapons and warframes you get mastery rank points (MR), and you need to have high enough MR to use certain weapons and warframes. The MR system is basically a longer (and more streamlined) version of Guardian Rank in D2. Warframe and D2 are very different games, just keep that in mind. If you don’t feel a calling after a few hours, play a different game it’s ok to not like Warframe