As far as the game goes, it's a good modding platform, but a very poor game in and of itself. The combat is clunky, the world generic, the lore utterly shit discounting the stuff ripped from the previous game, the quests poorly designed, it's buggy, it's poorly optimized(seriously some of the FLAT SURFACES range into the 400 polygon level of clusterfuckery,) let's face it, it's graphics, if I judged things by their graphics, were admittedly good for their time, haven't aged well, the distant land pales in comparison to the fan made Morrowind version, the game betrays the previously politically vibrant last few installments for what amount to cheap laughs, the leveling system was borked utterly, making you actually get weaker overtime, the creatures were bog standard lacking the originality of Morrowinds beastary, the quest compass reduced the act of exploring down to something a two year old could do, the magic system was borked with durations for standard spells bought from merchants being pointless, and alchemy potions being OP as hell, and I think I've said my piece.
Seven+One things make up for most of these flaws, QTP3(Textures), UOP(Bugs), PyFFI(Optimization of Meshes), FCOM+DR(Difficulty+Combat, I consider these mods as one package), BGs RBP(Better race design, with actual lore friendly races added as well), LAME(fixing the magic system for fun and profit) and Integration(20 hour main quest+15 hour side quest chain+20 hours of other side quests spread around= a whole new game, almost all of it lore friendly.) The extra one, FUCKING NEHRIM, if you have oblivion download it, you can't stand German voices because they remind you of when Hitler used to take you around the shed for some quality love, turn off the voices.