Yeah check out some maps by Mr. Clean or ones that use his texture pack based on

Also you might want to try Generations Arena, a mod that put the Q2 weapons and physics into the game (along with Doom,

and Wolfenstein, but you have the server setting option to disable those). Apart from the inclusion of shitty Wolfenstein Nazi shit in the mod, the main problem with it was the guns as seen from the POV of the player with them in his hands were too skinny, as if they were FOV 160 in FOV 90, so you had to play with cg_drawgun set to 0. Also, they completely ignored the importance of including low LOD versions of all the item pick-ups, so the framerate dropped MASSIVELY just looking at some load of items on the level (my computer had so much trouble rendering that that it would actually freeze the image for a whole second or so) unless you had cg_simpleitems 1 (they actually had made some new 2D icons for the game so you still got something new there at least.) You had to play as TankJr or Grunt (or Stripe) though, to be the Quake2 version player. Grunt sounds rubbish in Q3, but with some know-how (and a copy of Q2) you can make a Q2 soundpack for Q3 that puts the Q2 player soinds in Q3. I made one and it sounded better than in Q2! There are some levels included in Generations Arena that are Quake2 "base style" influenced, pretty enjoyable.
I have maps to recommend to play that mod in Q2 player mode in: Almost any of Mr Clean's maps and OSPDM12 - that hss a real Quake2 base feel to it and Mr C's maps just fit in with the Quake 2 style.